Add test log as an PR comment when backstage instance is not up/running

[josephca]

Description

When PR test fails in provisioning an RHDH instance, it needs to provide a more detailed error message and add a comment to the PR itself. Currently, test logs are added only when tests are started but not when failed in starting up the RHDH instance.

Which issue(s) does this PR fix

• Fixes https://issues.redhat.com/browse/RHIDP-1370

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

[josephca]

@subhashkhileri @gustavolira please review. Thanks!

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-988!

[janus-idp]

backstage-showcase Tests on commit 07b8972 finished successfully.
View test log

[sonarqubecloud]

Quality Gate failed

Failed conditions
3.1% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-988!

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gustavolira
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