MON-3410: Add FeatureGate for MetricsServer

[slashpai]

enhancement proposal: openshift/enhancements#1426

This feature will TechPreview in OCP 4.15 hence adding a feature gate where the feature is to be enabled only on TechPreview Clusters and not in standard cluster.

Goal is to disable the feature by default in 4.15 but enable it only in TechPreviewNoUpgrade clusters

cc: @simonpasquier

[openshift-ci-robot]

@slashpai: This pull request references MON-3410 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 sub-task to target the "4.15.0" version, but no target version was set.

In response to this:

enhancement proposal: openshift/enhancements#1426

This feature will TechPreview in OCP 4.15 hence adding a feature gate where the feature is to be enabled only on TechPreview Clusters and not in standard cluster.

Goal is to disable the feature by default in 4.15 but enable it only in TechPreviewNoUpgrade clusters

cc: @simonpasquier

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[openshift-ci]

Hello @slashpai! Some important instructions when contributing to openshift/api:
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[slashpai]

@simonpasquier PTAL

[slashpai]

/assign @simonpasquier

[simonpasquier]

/lgtm

[slashpai]

rebased

[simonpasquier]

/lgtm

[slashpai]

@deads2k Could you please review?

[slashpai]

/retest

[simonpasquier]

/lgtm

[JoelSpeed]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoelSpeed, simonpasquier, slashpai

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[openshift-ci]

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