Remove the prometheus-rules diff jobs and fix the alertmanager update job
- Remove the prometheus-rules diff jobs: it requires readwrite access (
patch
permission needed forkubectl diff
), I only added it today in !5741 (merged) so this is not something we had working before, and it runs inops
which doesn't make it visible anyway - Fix the alertmanager update job: I broke it in !5745 (merged)
Part of https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/17505 and https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16689