getFileDiffsWithBasehead(): use CODE_SCANNING_REPOSITORY if present #6691

Job	Run time
Multi-language repository (macos-latest, stable-v2.16.6)	10m 12s
Multi-language repository (ubuntu-latest, stable-v2.15.5)	4m 3s
Multi-language repository (ubuntu-latest, stable-v2.16.6)	4m 2s
Multi-language repository (macos-latest, stable-v2.15.5)	10m 13s
Multi-language repository (macos-latest, stable-v2.17.6)	7m 22s
Multi-language repository (ubuntu-latest, stable-v2.18.4)	4m 11s
Multi-language repository (macos-latest, linked)	7m 8s
Multi-language repository (macos-latest, default)	8m 14s
Multi-language repository (ubuntu-latest, stable-v2.17.6)	4m 9s
Multi-language repository (ubuntu-latest, nightly-latest)	3m 45s
Multi-language repository (ubuntu-latest, default)	3m 55s
Multi-language repository (macos-latest, nightly-latest)	7m 14s
Multi-language repository (ubuntu-latest, linked)	3m 48s
Multi-language repository (macos-latest, stable-v2.18.4)	9m 8s
Multi-language repository (ubuntu-latest, stable-v2.19.4)	4m 17s
Multi-language repository (macos-latest, stable-v2.19.4)	10m 23s
	1h 42m 4s

Provide feedback