front: reset stdcm state when hitting "new query" button

[clarani]

closes #10037

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.43%. Comparing base (2d1a142) to head (4aec1d0).
Report is 14 commits behind head on dev.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10223   +/-   ##
=======================================
  Coverage   81.42%   81.43%           
=======================================
  Files        1057     1058    +1     
  Lines      104204   104286   +82     
  Branches      720      723    +3     
=======================================
+ Hits        84849    84923   +74     
- Misses      19313    19321    +8     
  Partials       42       42           

Flag	Coverage Δ
editoast	73.59% <ø> (+0.01%)	⬆️
front	89.17% <100.00%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

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