Do updates, related to RHBQ 3.15.1 release

[fedinskiy]

Summary

• Remove daily runs
• Use Quarkus 3.15.1 for PRs
• Use fixed versions of external applications

Based on https://github.com/quarkus-qe/quarkus-test-framework/blob/main/CONTRIBUTING.md#branches

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
• Release (follows conventions described in the RELEASE.md)
• 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]

It's nice that you have it documented in https://github.com/quarkus-qe/quarkus-test-framework/blob/main/CONTRIBUTING.md#branches, but I don't like chagnes here, I'd prefer to use 3.15.999-SNAPSHOT. It was @rsvoboda who wrote that section 8190611 so I'll let me to review & approve & merge.

[rsvoboda]

PR.yaml - use 3.15.999-SNAPSHOT

[rsvoboda]

Also split into 2 commits would be better - one for GH action changes and one for code changes