Set up Python in mergeback workflow #10795

Job	Run time
check-codeql-versions	34s
analyze-other (python)	59s
analyze-other (actions)	46s
analyze-javascript (ubuntu-22.04)	4m 12s
analyze-javascript (ubuntu-24.04, linked)	4m 15s
analyze-javascript (macos-14, linked)	6m 4s
analyze-javascript (ubuntu-24.04)	4m 16s
analyze-javascript (windows-2022, linked)	4m 58s
analyze-javascript (ubuntu-22.04, linked)	4m 8s
analyze-javascript (windows-2022)	5m 9s
analyze-javascript (macos-13, linked)	11m 50s
analyze-javascript (macos-15, linked)	6m 18s
analyze-javascript (macos-13)	9m 18s
analyze-javascript (windows-2025)	5m 26s
analyze-javascript (macos-14)	6m 25s
analyze-javascript (windows-2025, linked)	10m 36s
analyze-javascript (macos-15)	5m 30s
	1h 30m 44s

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