Add ActionFeatureFlag extension

[vojtechszocs]

This PR allows extending detectFeatures in public/actions/features.ts module.

Existing setFlag and handleError functions should be reused when implementing detection of new, plugin-specific features.

cc @christianvogt @jtomasek @bipuladh

[vojtechszocs]

cc @spadgett

There are currently two use cases for this type of extension:

• ocs-independent-plugin (Independent Mode Dashboard #3907) - detect specific instance of OCSServiceModel
• metal3-plugin - move detectBaremetalPlatform from public/actions/features.ts to plugin

[vojtechszocs]

/retest

[vojtechszocs]

/retest

[jtomasek]

/lgtm

[rawagner]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jtomasek, rawagner, vojtechszocs

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[spadgett]

Makes sense, thanks @vojtechszocs

Related to this, we should look at adding a SelfSubjectAccessReview flag for detecting the user's permissions. For instance, to only show a nav item when the user can list the resource. It's needed for OLM, but I think it would be generally useful. (As a follow-on, not this PR.)

[spadgett]

/retest

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.