front: fix space time chart when first or last waypoint are hidden

[SharglutDev]

Filter data from projected path (path and occupancy blocks) and conflicts when the first or last waypoint is hidden. Allow the space time chart to look as if it started/ended with the first/last displayed waypoint.

part of #8628 (see last comment of the issue)

before :

after :

To test :

• Add at least 2 trains with only 1min difference for departure time
• With the waypoints panel, hide the first x waypoints and/or the last x waypoints

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 17.59259% with 89 lines in your changes missing coverage. Please review.

Project coverage is 41.81%. Comparing base (0e1ea9b) to head (6954523). Report is 14 commits behind head on dev.

Files with missing lines	Patch %	Lines
...WithSpaceTimeChart/ManchetteWithSpaceTimeChart.tsx	0.00%	81 Missing and 1 partial :warning:
...nResult/components/SpaceTimeChart/helpers/utils.ts	73.07%	0 Missing and 7 partials :warning:

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9513      +/-   ##
============================================
- Coverage     42.51%   41.81%   -0.70%     
  Complexity     2271     2271              
============================================
  Files          1311     1281      -30     
  Lines        105413   103982    -1431     
  Branches       3297     3304       +7     
============================================
- Hits          44812    43476    -1336     
+ Misses        58655    58553     -102     
- Partials       1946     1953       +7     

Flag	Coverage Δ
core	75.05% <ø> (ø)
editoast	73.65% <ø> (-0.05%)	:arrow_down:
front	18.79% <17.59%> (+<0.01%)	:arrow_up:
gateway	2.18% <ø> (-0.02%)	:arrow_down:
osrdyne	3.28% <ø> (ø)
railjson_generator	?
tests	86.74% <ø> (ø)

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[emersion]

Sorry for the duplicate comments. It seems @clarani and I ended up reviewing in parallel without noticing.