getFileDiffsWithBasehead(): use CODE_SCANNING_REPOSITORY if present #4625

Job	Run time
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.17.6)	1m 37s
Go: tracing with autobuilder step (macos-latest, default)	3m 35s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.16.6)	1m 24s
Go: tracing with autobuilder step (macos-latest, stable-v2.17.6)	3m 6s
Go: tracing with autobuilder step (macos-latest, stable-v2.16.6)	3m 56s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.19.4)	1m 37s
Go: tracing with autobuilder step (ubuntu-latest, default)	1m 22s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.15.5)	1m 19s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.18.4)	1m 28s
Go: tracing with autobuilder step (macos-latest, stable-v2.18.4)	4m 9s
Go: tracing with autobuilder step (macos-latest, stable-v2.19.4)	3m 16s
Go: tracing with autobuilder step (macos-latest, linked)	3m 26s
Go: tracing with autobuilder step (ubuntu-latest, nightly-latest)	1m 11s
Go: tracing with autobuilder step (ubuntu-latest, linked)	1m 14s
Go: tracing with autobuilder step (macos-latest, stable-v2.15.5)	5m 7s
Go: tracing with autobuilder step (macos-latest, nightly-latest)	4m 39s
	42m 26s

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