Add support for diagnostic tags, and use them for `mergeDefaultSetupAndUserConfigs` #8432

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 13s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 7s
Go: tracing with legacy workflow (macos-latest, linked)	9m 21s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.23.9)	1m 33s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 24s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.24.3)	1m 26s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 22s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 31s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 9s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	5m 7s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 18s
	26m 31s

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