MON-3839: test: add skip tests for prometheus adapter tests

[slashpai]

• [ ] I added CHANGELOG entry for this change.
• [x] No user facing changes, so no entry in CHANGELOG was needed.

[openshift-ci-robot]

@slashpai: This pull request references MON-3839 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2328): > > >* [ ] I added CHANGELOG entry for this change. >* [x] No user facing changes, so no entry in CHANGELOG was needed. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[slashpai]

/hold

[slashpai]

/hold cancel

[jan--f]

/lgtm

[jan--f]

/retest

[slashpai]

ok I need to remove prometheus-adapter from metrics map when feature gate is enabled

prometheus_test.go:53: context deadline exceeded: error getting first value from response body "{\"status\":\"success\",\"data\":{\"resultType\":\"vector\",\"result\":[],\"analysis\":{}}}\n" for query "count(up{service=\"prometheus-adapter\",namespace=\"openshift-monitoring\"} == 1)": expected body to contain single timeseries but got 0
--- FAIL: TestPrometheusMetrics (645.17s)
    --- PASS: TestPrometheusMetrics/metrics-server (5.01s)
    --- FAIL: TestPrometheusMetrics/prometheus-adapter (600.02s)

[jan--f]

Ahh right, WaitForQueryReturn can't deal with no result.

[slashpai]

@jan--f please review again updated

[jan--f]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jan--f, slashpai

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/cluster-monitoring-operator/blob/master/OWNERS)~~ [jan--f,slashpai] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[danielmellado]

/skip

[openshift-ci[bot]]

@slashpai: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-single-node	9bf5bf61d91f2c34d830a48c9a267180ce5e18ef	link	false	/test e2e-aws-ovn-single-node

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