pkg/server: get rules/alerts from thanos

[simonpasquier]

This is another attempt for #5941 but without removing the references to Prometheus. This is to see if it helps with the CI failures that the other PR faces.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci-robot]

@simonpasquier: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-gcp-console	c499b7c	link	/test e2e-gcp-console

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[simonpasquier]

/hold

[simonpasquier]

/close

[openshift-ci-robot]

@simonpasquier: Closed this PR.

In response to this:

/close

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