Emit warning for unrecognised repo properties with our common prefix #11783

Job	Run time
check-codeql-versions	16s
analyze-other (python)	59s
analyze-other (actions)	1m 4s
analyze-javascript (windows-2022)	6m 6s
analyze-javascript (ubuntu-24.04)	4m 31s
analyze-javascript (ubuntu-22.04, linked)	4m 34s
analyze-javascript (macos-14, linked)	5m 28s
analyze-javascript (windows-2025, linked)	7m 21s
analyze-javascript (windows-2025)	6m 39s
analyze-javascript (macos-14)	8m 55s
analyze-javascript (ubuntu-24.04, linked)	4m 28s
analyze-javascript (macos-15)	7m 53s
analyze-javascript (windows-2022, linked)	5m 53s
analyze-javascript (ubuntu-22.04)	4m 31s
analyze-javascript (macos-15, linked)	5m 2s
	1h 13m 40s

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