CNTRLPLANE-3738: Metrics provider prometheus url be more strict

[ingvagabund]

Make the prometheus URL validation more strict. Allowing only a single host to be present over a secure https.

To avoid accidentally sending data over an unsecured channel or to a non-compliant URL.

[openshift-ci]

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[openshift-ci-robot]

@ingvagabund: This pull request references CNTRLPLANE-3738 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 "5.0.0" version, but no target version was set.

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In response to this:

Make the prometheus URL validation more strict. Allowing only a single host to be present over a secure https.

To avoid accidentally sending data over an unsecured channel or to a non-compliant URL.

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[openshift-ci]

@ingvagabund: 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/security	2dff922	link	false	/test security

Full PR test history. Your PR dashboard.

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