Improve proxy certificate generation #11368

Job	Run time
analyze-other (python)	1m 3s
check-codeql-versions	37s
analyze-other (actions)	52s
analyze-javascript (windows-2022)	6m 11s
analyze-javascript (windows-2025, linked)	6m 35s
analyze-javascript (macos-14)	7m 21s
analyze-javascript (macos-15)	10m 54s
analyze-javascript (ubuntu-22.04)	4m 36s
analyze-javascript (ubuntu-24.04, linked)	4m 33s
analyze-javascript (ubuntu-22.04, linked)	4m 45s
analyze-javascript (macos-14, linked)	10m 7s
analyze-javascript (ubuntu-24.04)	4m 36s
analyze-javascript (windows-2025)	6m 29s
analyze-javascript (windows-2022, linked)	6m 4s
analyze-javascript (macos-15, linked)	8m 49s
	1h 23m 32s

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