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Make `auth` in `GitHubApiDetails` optional #11432

Job	Run time
Split workflow (ubuntu-latest, linked)	1m 19s
Split workflow (ubuntu-latest, nightly-latest)	1m 25s
Split workflow (ubuntu-latest, default)	1m 18s
Split workflow (macos-latest, default)	2m 12s
Split workflow (macos-latest, nightly-latest)	2m 9s
Split workflow (macos-latest, linked)	1m 29s
	9m 52s