fix: grant workspace users ImageStream read access

[akurinnoy]

What does this PR do?

Adds image.openshift.io/imagestreams: get, list to the OpenShift-specific rules in the workspace user ClusterRole (e.g. openshift-devspaces-cheworkspaces-clusterrole).

Non-admin Dev Spaces users couldn't list workspace backups stored in the OpenShift internal registry because the ClusterRole lacked ImageStream permissions. The dashboard backup listing failed with 403 Forbidden - the user saw either an empty list (before the companion dashboard fix) or an error notification (after).

This is the server-side companion to eclipse-che/che-dashboard#.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

resolves https://redhat.atlassian.net/browse/CRW-10984

How to test this PR?

1. Deploy the operator
2. Ensure the DWOC has backup configured with the OpenShift internal registry:

   config:
     workspace:
       backupCronJob:
         enable: true
         oras:
           extraArgs: '--insecure'
         registry:
           path: image-registry.openshift-image-registry.svc:5000
         schedule: '*/5 * * * *'

3. Login as a non-admin user, create a workspace
4. Stop the workspace, wait for backup to complete
5. Navigate to the Backups tab on the Workspaces page
6. Verify the backup list loads without errors

OpenShift

./build/scripts/olm/test-catalog-from-sources.sh

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

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[openshift-ci]

@akurinnoy: The following tests 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/v19-devworkspace-happy-path	5f0a41e	link	true	/test v19-devworkspace-happy-path
ci/prow/v19-upgrade-stable-to-next	5f0a41e	link	true	/test v19-upgrade-stable-to-next

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, rohanKanojia, tolusha

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