impr(new-nav): update lint rules for routeTree.gen file so we avoid useless git diffs

[rmnbrd]

Summary

PR updating the ESlint and Prettier rules so that we avoid useless git diffs on the routeTree.gen.ts file.

[RemiBonnet]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (new-navigation@e946f61). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             new-navigation    #2424   +/-   ##
=================================================
  Coverage                  ?   44.39%           
=================================================
  Files                     ?     1019           
  Lines                     ?    19741           
  Branches                  ?     5738           
=================================================
  Hits                      ?     8765           
  Misses                    ?     9386           
  Partials                  ?     1590           

Flag	Coverage Δ
unittests	44.39% <ø> (?)

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