getFileDiffsWithBasehead(): use CODE_SCANNING_REPOSITORY if present #9437

Job	Run time
check-codeql-versions	50s
analyze-actions	58s
analyze-javascript (ubuntu-22.04, linked)	4m 3s
analyze-javascript (ubuntu-20.04)	5m 16s
analyze-javascript (windows-2019, linked)	6m 0s
analyze-javascript (macos-14, linked)	4m 18s
analyze-javascript (ubuntu-22.04)	4m 8s
analyze-javascript (ubuntu-20.04, linked)	4m 25s
analyze-javascript (macos-13)	11m 55s
analyze-javascript (windows-2022)	7m 51s
analyze-javascript (windows-2022, linked)	7m 46s
analyze-javascript (macos-13, linked)	10m 51s
analyze-javascript (windows-2019)	6m 54s
analyze-javascript (macos-14)	4m 10s
	1h 19m 25s

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