For every alert for the kessel-relations-sync service in app-interface (see https://gitlab.cee.redhat.com/service/app-interface/-/merge_requests/123763), we should add tests to ensure they are working correctly.

See,

1. https://service.pages.redhat.com/dev-guidelines/docs/appsre/onboarding/observability/#prometheus-alerts-tests
2. https://gitlab.cee.redhat.com/service/app-interface//blob/master/docs/app-sre/prometheus-rules-tests-in-app-interface.md#prometheus[…]pp-interface
3. Tooling install: https://github.com/app-sre/qontract-reconcile?tab=readme-ov-file#installation

Definition of done:

1. prometheusrulestests files containing the tests per environment should be committed to app-interface alongside our prometheusrules files.
2. These tests should run on ci jobs and locally without failure.