refactor(file-router): tune server routes addition in case of variable routes presented

[Lodin]

Fixes #2404.

[ZheSun88]

  NX   Running target test:coverage for 16 projects failed

   Failed tasks:
   
   - @vaadin/hilla-file-router:test:coverage

[Lodin]

@ZheSun88, yeah, it looks like there is some kind of a FS handling on different systems. I cannot reproduce that locally but @taefi managed to do it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.15%. Comparing base (2c32e67) to head (1d431c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2448      +/-   ##
==========================================
+ Coverage   95.13%   95.15%   +0.02%     
==========================================
  Files          66       66              
  Lines        4501     4524      +23     
  Branches      646      649       +3     
==========================================
+ Hits         4282     4305      +23     
  Misses        178      178              
  Partials       41       41              

Flag	Coverage Δ
unittests	95.15% <100.00%> (+0.02%)	⬆️

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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]

Hi @Lodin and @ZheSun88, when i performed cherry-pick to this commit to 24.4, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 78f4f92
error: could not apply 78f4f92... refactor(file-router): tune server routes addition in case of variable routes presented (#2448)
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".