[BUG] contrib/google.golang.org/grpc: tests fail with shuffling enabled

[nsrip-dd]

As of main at commit f986cc5, the gRPC contrib tests fail with shuffling enabled (see #2265). There appears to be interference between the TestClientNamingSchema and TestIssue2050 test cases.

Example:

%  go test -run='(TestClientNamingSchema|TestIssue2050)' -shuffle=1703619841795279000 ./contrib/google.golang.org/grpc
-test.shuffle 1703619841795279000
2023/12/26 14:44:20 Datadog Tracer v1.60.0-dev WARN: No global service name was detected. GRPC Server may have been created before calling tracer.Start(). Will dynamically fetch service name for every span. Note this may have a slight performance cost, it is always recommended to start the tracer before initializing any traced packages.
2023/12/26 14:44:20 Datadog Tracer v1.60.0-dev WARN: No global service name was detected. GRPC Server may have been created before calling tracer.Start(). Will dynamically fetch service name for every span. Note this may have a slight performance cost, it is always recommended to start the tracer before initializing any traced packages.
2023/12/26 14:44:20 Datadog Tracer v1.60.0-dev WARN: DIAGNOSTICS Unable to reach agent intake: Post "http://localhost:8126/v0.4/traces": dial tcp 127.0.0.1:8126: connect: connection refused
2023/12/26 14:44:20 Datadog Tracer v1.60.0-dev INFO: DATADOG TRACER CONFIGURATION {"date":"2023-12-26T14:44:20-05:00","os_name":"darwin","os_version":"13.6.2","version":"v1.60.0-dev","lang":"Go","lang_version":"go1.20.7","env":"","service":"some-dd-service","agent_url":"http://localhost:8126/v0.4/traces","agent_error":"Post \"http://localhost:8126/v0.4/traces\": dial tcp 127.0.0.1:8126: connect: connection refused","debug":false,"analytics_enabled":false,"sample_rate":"NaN","sample_rate_limit":"disabled","sampling_rules":null,"sampling_rules_error":"","service_mappings":null,"tags":{"runtime-id":"4862f707-9373-4515-aada-a161bf77d910"},"runtime_metrics_enabled":false,"health_metrics_enabled":false,"profiler_code_hotspots_enabled":true,"profiler_endpoints_enabled":true,"dd_version":"","architecture":"arm64","global_service":"some-dd-service","lambda_mode":"false","appsec":false,"agent_features":{"DropP0s":false,"Stats":false,"DataStreams":false,"StatsdPort":0},
[ ... a bunch of integration info omitted ... ]
2023/12/26 14:44:22 Datadog Tracer v1.60.0-dev ERROR: Loading features: Get "http://localhost:8126/info": dial tcp 127.0.0.1:8126: connect: connection refused (occurred: 26 Dec 23 14:44 EST)
2023/12/26 14:44:22 Datadog Tracer v1.60.0-dev ERROR: failure sending traces (attempt 1), will retry: Post "http://localhost:8126/v0.4/traces": dial tcp 127.0.0.1:8126: connect: connection refused (occurred: 26 Dec 23 14:44 EST)
2023/12/26 14:44:22 Datadog Tracer v1.60.0-dev ERROR: lost 2 traces: <nil> (occurred: 26 Dec 23 14:44 EST)
--- FAIL: TestClientNamingSchema (0.86s)
    --- FAIL: TestClientNamingSchema/ServiceName (0.64s)
        --- FAIL: TestClientNamingSchema/ServiceName/WithDefaults (0.22s)
            --- FAIL: TestClientNamingSchema/ServiceName/WithDefaults/v1 (0.11s)
                namingschematest.go:101: 
                    	Error Trace:	/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:116
                    	            				/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:101
                    	Error:      	Not equal: 
                    	            	expected: "grpc.client"
                    	            	actual  : "some-dd-service"
                    	            	
                    	            	Diff:
                    	            	--- Expected
                    	            	+++ Actual
                    	            	@@ -1 +1 @@
                    	            	-grpc.client
                    	            	+some-dd-service
                    	Test:       	TestClientNamingSchema/ServiceName/WithDefaults/v1
                    	Messages:   	incorrect service name for span: grpc.client.request
                namingschematest.go:101: 
                    	Error Trace:	/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:116
                    	            				/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:101
                    	Error:      	Not equal: 
                    	            	expected: "grpc.client"
                    	            	actual  : "some-dd-service"
                    	            	
                    	            	Diff:
                    	            	--- Expected
                    	            	+++ Actual
                    	            	@@ -1 +1 @@
                    	            	-grpc.client
                    	            	+some-dd-service
                    	Test:       	TestClientNamingSchema/ServiceName/WithDefaults/v1
                    	Messages:   	incorrect service name for span: grpc.client.request
                namingschematest.go:101: 
                    	Error Trace:	/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:116
                    	            				/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:101
                    	Error:      	Not equal: 
                    	            	expected: "grpc.client"
                    	            	actual  : "some-dd-service"
                    	            	
                    	            	Diff:
                    	            	--- Expected
                    	            	+++ Actual
                    	            	@@ -1 +1 @@
                    	            	-grpc.client
                    	            	+some-dd-service
                    	Test:       	TestClientNamingSchema/ServiceName/WithDefaults/v1
                    	Messages:   	incorrect service name for span: grpc.client.request
                namingschematest.go:101: 
                    	Error Trace:	/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:116
                    	            				/Users/nick.ripley/repos/dd-trace-go/contrib/internal/namingschematest/namingschematest.go:101
                    	Error:      	Not equal: 
                    	            	expected: "grpc.client"
                    	            	actual  : "some-dd-service"
                    	            	
                    	            	Diff:
                    	            	--- Expected
                    	            	+++ Actual
                    	            	@@ -1 +1 @@
                    	            	-grpc.client
                    	            	+some-dd-service
                    	Test:       	TestClientNamingSchema/ServiceName/WithDefaults/v1
                    	Messages:   	incorrect service name for span: grpc.client.request
FAIL
FAIL	gopkg.in/DataDog/dd-trace-go.v1/contrib/google.golang.org/grpc	3.289s
FAIL