ci: integrate pr-title-lint into ci #9

Job	Run time
Conventional Commits	19s
Validate PR title	-9s
Proto (generate + git diff)	1m 24s
UI lint	54s
UI test	1m 18s
Go unit-tests	-1s
Go lint	-1s
Go fmt	-1s
Build (gitops, gitops-server)	-1s
Build and push gitops-server image	0s
Goreleaser (gitops CLI)	0s
Build and push Helm chart	0s
	3m 42s

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