Implement the Validate RPC on built-in plugins #8476

Job	Run time
cache-deps (windows)	55s
cache-deps (linux)	36s
images (linux)	6m 5s
lint (linux)	4m 53s
unit-test (ubuntu-22.04)	3m 32s
Build matrix	6s
unit-test (macos-latest)	3m 15s
unit-test (linux with race detection)	4m 57s
lint (windows)	7m 31s
unit-test (windows)	7m 7s
artifacts (windows)	5m 38s
integration (linux)	0s
integration-k8s	0s
artifacts (linux)	0s
images (windows)	0s
integration (windows)	0s
success	0s
	44m 35s

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