Add PR test for 1.1.x branch

[josephca]

Description

The current PR test is running only when the target is the 'main' branch. The same e2e test should be running for PRs for 1.1.x branch. Add additional test stage in the pipeline.

Which issue(s) does this PR fix

• Fixes https://issues.redhat.com/browse/RHIDP-1415

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

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-999!

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-999!

[janus-idp]

backstage-showcase Tests on commit 19a3ab8 finished successfully.
View test log

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-999!

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gustavolira
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