E2E pipeline simplification #1175

Job	Run time
build / Build	6m 50s
E2E Tests (startup)	7m 45s
E2E Tests (s3)	7m 10s
Docker Tests (basics)	55s
E2E Tests (btrfs)	4m 23s
Docker Tests (bootstraptoken)	46s
E2E Tests (externalip)	4m 17s
Docker Tests (cacerts)	49s
E2E Tests (privateregistry)	5m 30s
Docker Tests (compat)	2m 24s
E2E Tests (embeddedmirror)	4m 55s
Docker Tests (lazypull)	1m 3s
E2E Tests (wasm)	3m 57s
Docker Tests (upgrade)	2m 21s
	53m 5s

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