Refactor offline bits out of `Features` class and use for CCR #6905

Job	Run time
Go: tracing with autobuilder step (ubuntu-latest, linked)	1m 5s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.22.4)	1m 35s
Go: tracing with autobuilder step (macos-latest, nightly-latest)	6m 29s
Go: tracing with autobuilder step (macos-latest, linked)	7m 27s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.17.6)	1m 26s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.19.4)	1m 37s
Go: tracing with autobuilder step (macos-latest, default)	6m 37s
Go: tracing with autobuilder step (macos-latest, stable-v2.19.4)	5m 53s
Go: tracing with autobuilder step (ubuntu-latest, nightly-latest)	1m 26s
Go: tracing with autobuilder step (ubuntu-latest, default)	1m 28s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.20.7)	2m 22s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.21.4)	1m 20s
Go: tracing with autobuilder step (macos-latest, stable-v2.18.4)	7m 24s
Go: tracing with autobuilder step (macos-latest, stable-v2.22.4)	7m 5s
Go: tracing with autobuilder step (macos-latest, stable-v2.17.6)	6m 43s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.18.4)	2m 0s
Go: tracing with autobuilder step (macos-latest, stable-v2.20.7)	6m 36s
Go: tracing with autobuilder step (macos-latest, stable-v2.21.4)	5m 38s
	1h 14m 11s

Provide feedback