chore: some cleaning up, and adding context to the Observer related changes.

[czp13]

Description

Fixes # (issue) Cleaning up and giving a bit more details to those fixes happened with Observer, Quarkus version updates.

Type of change

• [ ] Bugfix
• [ ] Feature

Checklist

• [ ] I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• [ ] I have added a description following the guideline.
• [ ] The issue is created in the corresponding repository and I have referenced it.
• [ ] I have added tests to ensure my change is effective and works as intended.
• [ ] New and existing tests are passing locally with my change.
• [ ] I have performed self-review and corrected misspellings.

Additional for Feature type of change

• [ ] Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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