WIP pkg/server: get rules/alerts from thanos

[s-urbaniak]

This enables user workload alerting rules to be shown in the admin perspective.
As discussed in the arch call it is favorable to implement some filtering knobs first in the UI.
Additionally this requires thanos-io/thanos#2834 to be pulled in downstream first.

/cc @openshift/openshift-team-monitoring

[s-urbaniak]

/hold

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[simonpasquier]

/retest

[openshift-ci-robot]

@s-urbaniak: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-gcp-console	ae840a9	link	/test e2e-gcp-console

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[simonpasquier]

Superseded by #5941
/close

[openshift-ci-robot]

@simonpasquier: Closed this PR.

In response to this:

Superseded by #5941
/close

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