Refactor offline bits out of `Features` class and use for CCR #6957

Job	Run time
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.21.4)	1m 29s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.19.4)	1m 35s
Go: tracing with autobuilder step (macos-latest, stable-v2.22.4)	7m 9s
Go: tracing with autobuilder step (macos-latest, stable-v2.21.4)	5m 4s
Go: tracing with autobuilder step (macos-latest, linked)	4m 33s
Go: tracing with autobuilder step (macos-latest, default)	7m 12s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.17.6)	1m 31s
Go: tracing with autobuilder step (macos-latest, stable-v2.20.7)	4m 37s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.18.4)	1m 23s
Go: tracing with autobuilder step (ubuntu-latest, nightly-latest)	1m 11s
Go: tracing with autobuilder step (macos-latest, stable-v2.18.4)	6m 0s
Go: tracing with autobuilder step (ubuntu-latest, default)	1m 4s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.22.4)	1m 24s
Go: tracing with autobuilder step (macos-latest, stable-v2.17.6)	5m 30s
Go: tracing with autobuilder step (macos-latest, stable-v2.19.4)	7m 33s
Go: tracing with autobuilder step (macos-latest, nightly-latest)	6m 33s
Go: tracing with autobuilder step (ubuntu-latest, linked)	1m 11s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.20.7)	1m 18s
	1h 6m 17s

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