front: add e2e tests search and filter rolling stock

[Maymanaf]

The locked RS filter wasn't added in this test : Can't add a locked train for now to the list of the existing rolling stock
( To be determined later)

Closes : #7826

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 28.53%. Comparing base (7373ef1) to head (3fbdcc7).
Report is 27 commits behind head on dev.

Files	Patch %	Lines
...RollingStockEditor/RollingStockEditorFormModal.tsx	0.00%	7 Missing ⚠️
...s/RollingStockEditor/RollingStockEditorButtons.tsx	0.00%	3 Missing ⚠️
...onents/RollingStockSelector/SearchRollingStock.tsx	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7887      +/-   ##
============================================
- Coverage     28.68%   28.53%   -0.15%     
- Complexity     2058     2059       +1     
============================================
  Files          1249     1249              
  Lines        154454   154219     -235     
  Branches       3041     3036       -5     
============================================
- Hits          44306    44014     -292     
- Misses       108334   108395      +61     
+ Partials       1814     1810       -4     

Flag	Coverage Δ
core	74.95% <ø> (-0.04%)	⬇️
editoast	71.63% <ø> (-0.40%)	⬇️
front	10.01% <0.00%> (-0.01%)	⬇️
gateway	2.34% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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