Add proto validation for cursor indexes #7562

Job	Run time
build / Verify build	2m 1s
license-check / License boilerplate check	11s
lint / Run golangci-lint	3m 0s
lint / Uncommitted changes check - go mod tidy & make gen	3m 33s
compose-migrate / docker	2m 34s
image-build / Build Helm chart	3m 21s
image-build / Check docker image build	2m 18s
image-build / Image build	3m 13s
security / Security Scan	20s
test / Authz tests	2m 44s
test / Unit testing	9m 43s
	32m 58s

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