OCPBUGS-56179: Add isAllNamespacesKey function to dynamic plugin API

[vojtechszocs]

This adds new isAllNamespacesKey utility function so that plugins don't have to hardcode #ALL_NS# value.

[openshift-ci-robot]

@vojtechszocs: This pull request references Jira Issue OCPBUGS-56179, which is invalid:

• expected the bug to target the "4.20.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

This adds new isAllNamespacesKey utility function so that plugins don't have to hardcode #ALL_NS# value.

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[vojtechszocs]

/retest

[spadgett]

/lgtm
/label plugin-api-approved

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spadgett, vojtechszocs

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• frontend/OWNERS [spadgett,vojtechszocs]

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[kyoto]

/retest

[openshift-ci]

@vojtechszocs: all tests passed!

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