Allow configuring CODEQL_THREADS with an env var #9566

Job	Run time
check-codeql-versions	45s
analyze-actions	56s
analyze-javascript (ubuntu-22.04)	4m 0s
analyze-javascript (ubuntu-22.04, linked)	3m 55s
analyze-javascript (windows-2019)	6m 44s
analyze-javascript (ubuntu-24.04)	3m 53s
analyze-javascript (ubuntu-24.04, linked)	3m 48s
analyze-javascript (windows-2019, linked)	7m 26s
analyze-javascript (windows-2022)	5m 7s
analyze-javascript (macos-14)	5m 26s
analyze-javascript (macos-13)	9m 1s
analyze-javascript (macos-13, linked)	5m 24s
analyze-javascript (windows-2022, linked)	5m 12s
analyze-javascript (macos-14, linked)	3m 56s
	1h 5m 33s

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