Add support for validation jobs to `sync.ts`, and refactor #7147

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 7s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 19s
Go: tracing with custom build steps (ubuntu-latest, linked)	52s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 32s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 20s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 18s
Go: tracing with custom build steps (ubuntu-latest, default)	53s
Go: tracing with custom build steps (macos-latest, linked)	2m 54s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 29s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 34s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 40s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 32s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 4s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	59s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 30s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 1s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 31s
Go: tracing with custom build steps (macos-latest, default)	2m 16s
	32m 51s

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