Repository navigation

Make `auth` in `GitHubApiDetails` optional #350

Job	Run time
Per-language bundles (csharp, ubuntu-latest, nightly-latest, none)	1m 13s
Per-language bundles (go, ubuntu-latest, nightly-latest, autobuild)	1m 8s
Per-language bundles (javascript, ubuntu-latest, nightly-latest)	54s
Per-language bundles (python, ubuntu-latest, nightly-latest)	52s
Per-language bundles (ruby, ubuntu-latest, nightly-latest)	51s
Per-language bundles (java, ubuntu-latest, nightly-latest, none)	1m 6s
Per-language bundles (cpp, ubuntu-latest, nightly-latest, manual, gcc -o main main.c)	50s
Per-language bundles (rust, ubuntu-latest, nightly-latest)	1m 55s
Per-language bundles (actions, ubuntu-latest, nightly-latest, actions javascript)	48s
Per-language bundles (swift, macos-latest-xlarge, nightly-latest, autobuild)	7m 35s
	17m 12s