Remove support for combining SARIF runs with non-unique categories #9757

Job	Run time
analyze-actions	59s
check-codeql-versions	59s
analyze-javascript (ubuntu-22.04, linked)	4m 1s
analyze-javascript (ubuntu-24.04, linked)	4m 4s
analyze-javascript (windows-2025)	6m 28s
analyze-javascript (ubuntu-22.04)	4m 28s
analyze-javascript (windows-2022, linked)	6m 28s
analyze-javascript (macos-15)	7m 15s
analyze-javascript (macos-14, linked)	6m 44s
analyze-javascript (macos-13)	9m 54s
analyze-javascript (windows-2022)	6m 14s
analyze-javascript (windows-2025, linked)	6m 46s
analyze-javascript (macos-15, linked)	8m 0s
analyze-javascript (macos-13, linked)	13m 45s
analyze-javascript (macos-14)	7m 25s
analyze-javascript (ubuntu-24.04)	4m 12s
	1h 37m 42s

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