Add random suffix when writing diagnostics to avoid filename collisions #12155

Job	Run time
check-codeql-versions	17s
analyze-other (python)	54s
analyze-other (actions)	53s
analyze-javascript (ubuntu-22.04)	4m 33s
analyze-javascript (windows-2022, linked)	6m 30s
analyze-javascript (ubuntu-24.04)	4m 33s
analyze-javascript (ubuntu-24.04, linked)	4m 27s
analyze-javascript (macos-14)	5m 49s
analyze-javascript (ubuntu-22.04, linked)	4m 54s
analyze-javascript (windows-2022)	6m 7s
analyze-javascript (windows-2025, linked)	6m 17s
analyze-javascript (macos-15)	7m 56s
analyze-javascript (windows-2025)	6m 41s
analyze-javascript (macos-15, linked)	5m 36s
analyze-javascript (macos-14, linked)	5m 41s
	1h 11m 8s

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