feat(RELEASE-1431): add cluster information

[davidmogar]

Update availability query to expose cluster name.

[davidmogar]

/retest

[pacho-rh]

/retest

[pacho-rh]

Hello, the checks are failing on the alert unit testing:

FATA[0007] [test/promql/tests/data_plane/release_service_test.yaml] failed to run 'promtool test rules'; output:
Unit Testing:  /tmp/obsctl-reloader-rules-checker906667314/release_service_test.yaml
  FAILED:
    name: ReleaseServiceControllerAvailabilityAlertOnClusterDataMissingSLOFailure,
    alertname: ReleaseServiceControllerManagerAvailability, time: 1d, 
        exp:[
            0:
              Labels:{alertname="ReleaseServiceControllerManagerAvailability", severity="critical", slo="true", source_cluster="stone-prod-p02"}
              Annotations:{alert_team_handle="<!subteam^S03SVBS426R>", description="The Release Service Controller Manager is failing to be available for 99% of the time", runbook_url="https://gitlab.cee.redhat.com/konflux/docs/sop/-/blob/main/release-service/release-controller-availability.md?ref_type=heads", summary="The Release Service Controller Manager must be available 99% of the time", team="release"}
            ], 
        got:[]


 
make: *** [Makefile:23: check-and-test] Error 1

You can run the alert unit tests locally by running make check-and-test