fix: request full-reload only when file-routes.json is added/changed

[taefi]

Description

Request for full-reloads in dev mode to only when file-router's vite-plugin ends up adding/updating the file-routes.json.
Other changes to the frontend/views directory should not result in full-reload.

Fixes: #2277

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.21%. Comparing base (bf9054d) to head (d2fe861).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2289      +/-   ##
==========================================
- Coverage   95.38%   95.21%   -0.17%     
==========================================
  Files          65       66       +1     
  Lines        4157     4288     +131     
  Branches      604      609       +5     
==========================================
+ Hits         3965     4083     +118     
- Misses        150      163      +13     
  Partials       42       42              

Flag	Coverage Δ
unittests	95.21% <100.00%> (-0.17%)	⬇️

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[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]

This ticket/PR has been released with Hilla 24.4.0.alpha19 and is also targeting the upcoming stable 24.4.0 version.