front: refacto signals settings on maps, removing signal's list concept

[nicolaswurtz]

This PR fixes:

• close Signals are not displayed in the editor #5474
• close Signal's masts & blue points not displayed on maps #5476

It removes "signallist" logic that's today irrelevant: backend only sends one layer without signal's type anymore.
Too much filters existed before that prevented signals and their assets to display.

[codecov]

Codecov Report

Merging #5472 (e7737ff) into dev (74fc252) will increase coverage by 0.02%.
The diff coverage is 2.89%.

@@             Coverage Diff              @@
##                dev    #5472      +/-   ##
============================================
+ Coverage     18.80%   18.82%   +0.02%     
  Complexity     2320     2320              
============================================
  Files           860      859       -1     
  Lines        103596   103400     -196     
  Branches       2412     2410       -2     
============================================
- Hits          19479    19465      -14     
+ Misses        82769    82589     -180     
+ Partials       1348     1346       -2     

Flag	Coverage Δ
front	7.14% <2.89%> (ø)

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Files	Coverage Δ
...lications/editor/tools/pointEdition/components.tsx	0.00% <ø> (ø)
front/src/common/Map/Layers/types.ts	0.00% <ø> (ø)
front/src/reducers/index.ts	100.00% <ø> (ø)
front/src/reducers/map/index.ts	82.79% <100.00%> (-0.71%)	⬇️
front/src/reducers/map/selectors.ts	0.00% <ø> (ø)
front/src/common/Map/Layers/BufferStops.tsx	0.00% <0.00%> (ø)
front/src/common/Map/Layers/Detectors.tsx	0.00% <0.00%> (ø)
front/src/common/Map/Layers/geoSignalsLayers.ts	0.00% <0.00%> (ø)
front/src/common/Map/Layers/GeoJSONs.tsx	0.00% <0.00%> (ø)
front/src/common/Map/Layers/Signals.tsx	0.00% <0.00%> (ø)
... and 1 more