Add path-filtered CodeQL workflow for content-specific analysis #4

Job	Run time
Detect changed paths	7s
Analyze (actions)	1m 2s
Analyze (python)	2s
Analyze (go)	4s
Analyze (javascript-typescript)	4s
Analyze (csharp)	3s
Analyze (java-kotlin)	5s
	1m 27s

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