fix(file-router): allow routes with the same path

[Lodin]

Fixes #2954.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.52%. Comparing base (35aaded) to head (551221f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...e-router/src/runtime/RouterConfigurationBuilder.ts	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2971      +/-   ##
==========================================
- Coverage   92.61%   92.52%   -0.09%     
==========================================
  Files          84       84              
  Lines        3156     3159       +3     
  Branches      769      770       +1     
==========================================
  Hits         2923     2923              
- Misses        181      184       +3     
  Partials       52       52              

Flag	Coverage Δ
unittests	92.52% <89.47%> (-0.09%)	⬇️

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[vaadin-bot]

Hi @Lodin and @ZheSun88, when i performed cherry-pick to this commit to 24.6, i have encountered the following issue. Can you take a look and pick it manually?
Error Message:
Error: Command failed: git cherry-pick 0a72e18
error: could not apply 0a72e18... fix(file-router): allow routes with the same path (#2971)
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".