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Make `auth` in `GitHubApiDetails` optional #2424

Job	Run time
Analysis kinds (ubuntu-latest, nightly-latest, code-quality)	47s
Analysis kinds (ubuntu-latest, linked, code-quality)	54s
Analysis kinds (ubuntu-latest, nightly-latest, code-scanning,code-quality)	57s
Analysis kinds (ubuntu-latest, linked, code-scanning,code-quality)	1m 2s
Analysis kinds (ubuntu-latest, nightly-latest, risk-assessment)	54s
Analysis kinds (ubuntu-latest, linked, risk-assessment)	53s
Analysis kinds (ubuntu-latest, nightly-latest, code-scanning)	58s
Analysis kinds (ubuntu-latest, linked, code-scanning)	55s
	7m 20s