chore(e2e): enable pipeline execution and pipeline operator installation

[gustavolira]

Uncommented the code responsible for applying pipeline resources to ensure the hello-world pipeline runs as expected. Restored the install_pipelines_operator function to automate the installation of the Pipeline Operator.

Description

Please explain the changes you made here.

Which issue(s) does this PR fix

• Fixes #?

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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

The image is available at:

• quay.io/janus-idp/backstage-showcase:pr-1985 or
• quay.io/janus-idp/backstage-showcase:pr-1985-9499d8ed

[openshift-merge-robot]

PR needs rebase.

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[zdrapela]

When you enable OpenShift pipelines, please enable also Tekton Pipelines for Kubernetes tests (AKS and GKE).
Feel free to cherry pick this commit that does that: zdrapela@0036f7d

[gustavolira]

@zdrapela why do we need Tekton Pipelines ?

[zdrapela]

@zdrapela why do we need Tekton Pipelines ?

Because OpenShift pipelines doesn't work on Kubernetes (like AKS and GKE), but Tekton pipelines works (that's upstream of OpenShift pipelines).

[openshift-ci]

@gustavolira: 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/e2e-tests	9499d8e	link	true	/test e2e-tests
ci/prow/images	9499d8e	link	true	/test images

Full PR test history. Your PR dashboard.

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