Implement the Validate RPC on built-in plugins #7982

Job	Run time
cache-deps (windows)	1m 31s
cache-deps (linux)	52s
lint (linux)	5m 3s
images (linux)	6m 12s
unit-test (ubuntu-22.04)	4m 28s
Build matrix	4s
unit-test (macos-latest)	4m 24s
unit-test (linux with race detection)	5m 21s
unit-test (windows)	7m 44s
lint (windows)	8m 29s
artifacts (windows)	6m 34s
integration-k8s	0s
integration (linux)	0s
artifacts (linux)	0s
images (windows)	0s
integration (windows)	0s
success	0s
	50m 42s

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