chore: Parallelize EnsureCleanState for e2e tests, adding timing information #35576

Job	Run time
changes	14s
Build & cache Go code	3m 2s
Check changes to generated code	4m 37s
Build, test & lint UI code	1m 28s
Ensure Go modules synchronicity	17s
Lint Go code	2m 53s
Run unit tests for Go packages	4m 58s
Run unit tests with -race for Go packages	8m 45s
Run end-to-end tests (v1.31.0, true)	29m 42s
Run end-to-end tests (v1.30.4, false)	24m 56s
Run end-to-end tests (v1.29.8, false)	30m 31s
Run end-to-end tests (v1.28.13, false)	20m 46s
E2E Tests - Composite result	1s
Process & analyze test artifacts	46s
	2h 12m 56s

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