feat: support multiple sync sources #6724

Job	Run time
Check codegen and manifest	3m 18s
[Generator Resource Expansion] Build and Test	10m 9s
Build and Test (1.24.12)	10m 23s
Build and Test (1.25.8)	10m 21s
Build and Test (1.26.3)	10m 4s
Build and Test (1.27.1)	8m 55s
Test Gator	3m 57s
[Helm] Build and Test (3.7.2, gatekeeper-system)	8m 27s
[Helm] Build and Test (3.7.2, custom-namespace)	7m 11s
Lint	1m 14s
[Trivy] Scan for vulnerabilities	2m 59s
Unit test	8m 4s
	1h 25m 2s

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