Add the Smoke test PR check for Dashboard repository

[dmytro-ndp]

Is your task related to a problem? Please describe

Run Smoke GUI test on new pull request or new commit to pull request in repo https://github.com/eclipse-che/che-dashboard

Describe the solution you'd like

Create GitHub actions on pull request events to do:

1. Wait on successful build of GitHub action "docker-build" [e.g. https://github.com/eclipse-che/che-dashboard/actions/runs/4952254169/jobs/8858567817)
2. Deploy OpenShift instance on Prow CI.
3. Install Eclipse Che next using dashboard image from PR by patching CheCluster [1], e.g.:

apiVersion: org.eclipse.che/v2
spec:
  components:
    dashboard:
      dashboardImage: '$CI_CHE_DASHBOARD_IMAGE'

CI_CHE_DASHBOARD_IMAGE = quay.io/eclipse-che/che-dashboard:pr-<PR_NUMBER>

4. Run smoke GUI test against Eclipse Che instance.
5. Collect the logs and shutdown OpenShift instance.

[1] https://github.com/eclipse-che/che-dashboard/blob/main/.ci/oci-dashboard-happy-path.sh#L24-L29

Technical debts:

1. Get rid of "test-all-devfiles" command: https://github.com/eclipse/che/blob/main/tests/e2e/package.json#L13
2. Replace redundant outdated constant TS_SELENIUM_USERNAME with TS_SELENIUM_OCP_USERNAME
3. Replace redundant outdated constant TS_SELENIUM_PASSWORD with TS_SELENIUM_OCP_PASSWORD

Describe alternatives you've considered

No response

Additional context

No response