fix: fire change event on hyperlink edit, update test timings

[web-padawan]

Description

Fixes #7249

When adding link, the change event was not fired by vaadin-rich-text-editor. Here's what happened:

• editor gets focus as a result of this._editor.format('link', link, SOURCE.USER),
• the editor content focus event listener calls _cleanToolbarState() immediately,
• in value change observer, no change event due to the toolbar in "default" state.

Added a check for _linkEditing (which corresponds to the link dialog opened property) as a fix.

Note: when removing the focus listener completely, all the tests still pass on main branch 🙈

Type of change

• Bugfix

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[vaadin-bot]

Hi @web-padawan and @web-padawan, when i performed cherry-pick to this commit to 23.4, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 9c24c1d
error: could not apply 9c24c1d... fix: fire change event on hyperlink edit, update test timings (#7250)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.4.0.alpha17 and is also targeting the upcoming stable 24.4.0 version.