use renamed script and param for external-domain-tls

[ReToCode]

Follow-up for knative/serving#14482

Which issue(s) this PR fixes:
Fixes knative/serving#14369

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[ReToCode]

/assign @dprotaso

[krsna-m]

/lgtm

[knative-prow]

@ReToCode: Updated the job-config configmap in namespace default at cluster default using the following files:

• key serving-main.gen.yaml using file prow/jobs/generated/knative/serving-main.gen.yaml

In response to this:

Follow-up for knative/serving#14482

Which issue(s) this PR fixes:
Fixes knative/serving#14369

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