feat: Remove the explicit DWCO (un)installation steps.

[metlos]

What does this PR do?

Make sure that DWCO related objects are deleted during che-operator uninstallation instead of devworkspace uninstallation.

This only makes sense when the referenced issues are merged.

What issues does this PR fix or reference?

eclipse-che/che#19402
eclipse-che/che#19847

How to test this PR?

1. Install Che using the operator
2. Delete the Che installation using chectl server:delete
3. Make sure it works OK

   oc get clusterroles | grep devworkspace-che
   oc get roles -n eclipse-che | grep devworkspace-che
   oc get rolebindings -n eclipse-che | grep devworkspace-che
   oc get clusterrolebindings -n eclipse-che | grep devworkspace-che
   

4. Install Che using the operator again
5. Enable devworkspaces

   oc patch checluster eclipse-che -n eclipse-che --type=json -p '[{"op": "replace", "path": "/spec/devWorkspace/enable", "value": true}]'
   

6. Delete the Che installation using chectl server:delete again
7. Make sure there are no remnants of DWCO using the step 3

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
• Sections What issues does this PR fix or reference and How to test this PR completed
• 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.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: metlos, tolusha

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[mmorhun]

Rebased

[mmorhun]

I've investigated why the e2e update tests tests fails and the problem is not related to the changes in this PR.