Remove Prometheus adapter

[marioferh]

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

[openshift-ci]

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[marioferh]

/hold

[juzhao]

since k8sPrometheusAdapter is removed, not deprecated any more, I think we should delete the deprecated setting for k8sPrometheusAdapter in below files

Documentation/api.md
Documentation/openshiftdocs/index.adoc
Documentation/openshiftdocs/modules/k8sprometheusadapter.adoc
pkg/manifests/config_test.go
test/e2e/config_test.go

[marioferh]

Documentation/openshiftdocs/modules/k8sprometheusadapter.adoc

thx

[slashpai]

We would want to block upgrades if Prometheus adapter config still exists in config map.

[openshift-ci]

@marioferh: 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/unit	0c5c404	link	true	/test unit

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[jan--f]

#2651 implements the updating block. The config field removal should wait till 4.21.

[openshift-merge-robot]

PR needs rebase.

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