Add path-filtered CodeQL workflow for content-specific analysis #3

Job	Run time
Detect changed paths	6s
Analyze (java-kotlin)	2s
Analyze (javascript-typescript)	5s
Analyze (go)	5s
Analyze (csharp)	4s
Analyze (actions)	1m 3s
Analyze (python)	4s
	1m 29s

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