Add proto validation for invite codes #7560

Job	Run time
build / Verify build	2m 7s
license-check / License boilerplate check	13s
lint / Uncommitted changes check - go mod tidy & make gen	3m 23s
lint / Run golangci-lint	3m 3s
compose-migrate / docker	2m 46s
image-build / Build Helm chart	3m 15s
image-build / Check docker image build	2m 22s
image-build / Image build	3m 21s
security / Security Scan	18s
test / Authz tests	2m 53s
test / Unit testing	9m 37s
	33m 18s

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