front: enhance pathfinding loading state management

[SarahBellaha]

Completes this PR

This PR will add a loader while the pathfinding is still computing, and the map's viewport will be updated only once it is finished, avoiding the 'shaking' effect.

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All modified and coverable lines are covered by tests ✅

Project coverage is 81.79%. Comparing base (ecb261f) to head (1e7311c).

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@@            Coverage Diff             @@
##              dev   #10292      +/-   ##
==========================================
- Coverage   81.85%   81.79%   -0.06%     
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  Files        1075     1057      -18     
  Lines      107172   106211     -961     
  Branches      728      728              
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- Hits        87726    86877     -849     
+ Misses      19407    19295     -112     
  Partials       39       39              

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editoast	74.24% <ø> (ø)
front	89.38% <100.00%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	?

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[Caracol3]

LGTM and tested !

[SharglutDev]

Tested and everything works great, good job ! Just a few comments.

Also before merging, I would rather show the loader animation on the map to @thibautsailly to be sure it's ok for him since he also requested to @Caracol3 the blue loader below the form.

[SharglutDev]

Lgtm and tested, one last comment. Just waiting for you to fix conflicts to test one more time and we should be good to go :)

[SharglutDev]

This PR can be rebase with last changes from this one :)

[SharglutDev]

After the rebase, I have 2 behaviors issues. Both are probably related and coming from the switch from useLazyQuery to useQuery.

[SharglutDev]

When a pathfinding is loading, it seems the loading banner is always green and not blue

[SharglutDev]

For a path like Brest > Narbonne > Perpignan (but should work for any path with a via), if I remove the origin, pathProperties endpoint is fired again (but it shouldn't, it's not the case right now) and bbox on map is updated with a path containing the via as if it was the origin and the destination.
When checking the network tab in dev tools, we see only pathProperties endpoint launching but in its payload, we can see that the track_section_ranges doesn't have the same length. So rtk query is probably relaunching pathfinding blocks as well in the dark.