[WFLY-18464] ejb-multi-server Quickstart Common Enhancements CY2023Q3

[emmartins]

Issue: https://issues.redhat.com/browse/WFLY-18464

Changes on top of #842:

• Renamed workflow to correct filename: quickstart_ejb-multi-server_ci.yml
• Moved workflow to correct directory: /.github/workflows (not ejb-multi-server/.github/workflows)
• Fixed content in the workflow
• Replaced custom sections in README with includes for related ones in shared-docs, wrt deploy and undeploy (and removed ref to standalone start in that deploy section)
• Added include of integration tests section from shared-docs (and added customization of test sources dir in it)
• Removed unused cli scripts to deploy and undeploy domain
• Fixed plugin management for wildfly maven plugin
• Updated server.version value

[emmartins]

hi @tadamski , I created this PR on top of the commits you did at #842 , please review my commit changes (see PR description above for details on those), if you agree I will squash all commits and merge this instead of #842

Btw, answering your doubts there sure it's fine to limit the scope of this QS due to complexity, and thus skip server provisioning and openshift.

I believe there is much to improve wrt integration testing, such as replacing the client's exec:java with an integration test, which could even be just an invocation of "http://localhost:8380/ejb-multi-server-app-web" and verify response content, but we can discuss that later as a followup.

[emmartins]

@tadamski ^^

[tadamski]

@emmartins LGTM, thanks!