Adapt enabling of continuous testing to new DEV UI

[michalvavrik]

Summary

Adapts enabling of continuous testing to new DEV UI added by quarkusio/quarkus#32491.
HtmlUnit doesn't handle Vaadin correctly (likely because of importmaps), I decided to use PlayWright as Phillip Krüger suggested that's what he eventually plans to use and Aleš Justin also experiments with it: https://quarkusio.zulipchat.com/#narrow/stream/187038-dev/topic/Testing.20in.20Dev.20UI

It turned out that HtmlUnit dependency brought in also Apache Commons utils we used in past, however I could easily avoid using this dependency (they are just simple util methods), so I dropped it from here. If anyone needs this in the future (e.g. in TS etc.), they should add it directly and only the dependency they really need.

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[michalvavrik]

The failure is unrelated, it is the same thing as in the TS quarkus-qe/quarkus-test-suite#1148

[mjurc]

Thanks for the update.