Set up Python in mergeback workflow #10796

Job	Run time
check-codeql-versions	35s
analyze-other (python)	58s
analyze-other (actions)	51s
analyze-javascript (ubuntu-22.04, linked)	4m 14s
analyze-javascript (windows-2025, linked)	9m 23s
analyze-javascript (windows-2022)	5m 9s
analyze-javascript (ubuntu-22.04)	4m 12s
analyze-javascript (macos-14)	6m 17s
analyze-javascript (ubuntu-24.04)	4m 15s
analyze-javascript (macos-13, linked)	7m 10s
analyze-javascript (macos-13)	11m 4s
analyze-javascript (macos-14, linked)	8m 2s
analyze-javascript (macos-15, linked)	8m 59s
analyze-javascript (macos-15)	5m 38s
analyze-javascript (ubuntu-24.04, linked)	4m 3s
analyze-javascript (windows-2025)	8m 2s
analyze-javascript (windows-2022, linked)	5m 14s
	1h 34m 6s

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