Add support for validation jobs to `sync.ts`, and refactor #7258

Job	Run time
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 26s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 0s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 39s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 23s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 8s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 12s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 24s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 5s
Go: tracing with custom build steps (macos-latest, default)	2m 39s
Go: tracing with custom build steps (ubuntu-latest, default)	59s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 46s
Go: tracing with custom build steps (ubuntu-latest, linked)	55s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 9s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	1m 58s
Go: tracing with custom build steps (macos-latest, linked)	2m 46s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 22s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 14s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 17s
	32m 22s

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