Move diff-range computation into utils #10720

Job	Run time
analyze-other (actions)	52s
check-codeql-versions	32s
analyze-other (python)	57s
analyze-javascript (ubuntu-22.04, linked)	4m 13s
analyze-javascript (windows-2025, linked)	6m 33s
analyze-javascript (ubuntu-24.04, linked)	4m 8s
analyze-javascript (windows-2022)	5m 22s
analyze-javascript (windows-2022, linked)	5m 36s
analyze-javascript (ubuntu-24.04)	4m 10s
analyze-javascript (macos-14, linked)	5m 4s
analyze-javascript (windows-2025)	7m 37s
analyze-javascript (ubuntu-22.04)	4m 3s
analyze-javascript (macos-14)	13m 34s
analyze-javascript (macos-13, linked)	11m 34s
analyze-javascript (macos-13)	8m 36s
analyze-javascript (macos-15)	7m 30s
analyze-javascript (macos-15, linked)	5m 34s
	1h 35m 55s

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