Refactor namespace deletion logic and add finalizer removal.

[gustavolira]

Refactor configure_namespace by extracting namespace deletion into a new function delete_namespace. Introduce functions to remove blocking finalizers and forcibly delete namespaces stuck in 'Terminating' status. This improves reliability and handling of namespace deletions in the OpenShift CI pipeline.

Description

Please explain the changes you made here.

Which issue(s) does this PR fix

• Fixes RHIDP-4752, RHIDP-4775

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[openshift-ci]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1866!

[openshift-ci]

@gustavolira: The following test 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/e2e-tests	76eaae5	link	true	/test e2e-tests

Full PR test history. Your PR dashboard.

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[josephca]

/lgtm
/approve