chore: Add support for extra in validating webhook #377

Job	Run time
changed-files / changed-files	10s
calculate-tag / calculate-tag	7s
check-license / check-license	36s
check-md-links / changed-files	10s
unit-test / changes	5s
unit-test / go (verify)	4m 30s
unit-test / ui	0s
unit-test / go (test)	11m 42s
check-md-links / markdown-link-check	11s
build-targets / build-chart	9s
build-targets / build-images	1m 14s
build-targets / build-e2e-binary	1m 41s
build-targets / Build passed	0s
release	0s
integration-test	0s
e2e-test	0s
All Checks Pass	1s
	20m 36s

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