Adapt route calculation

[flomonster]

Description

close https://github.com/osrd-project/osrd-confidential/issues/496

Allow implicit nodes when they have one group.

Note

We still have a nonambiguous description of the route.
We don't need a migration since it's optional to provide implicit node positions.

Motivation

We can now split tracks in the editor. This creates a new "track section link" and breaks a lot of routes doing so. We could:

• Lookup for all routes that should be updated
• Change how routes are built in editoast and core to allow implicit nodes with only one group/config.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.81%. Comparing base (afc1c50) to head (b376162).
Report is 1 commits behind head on dev.

❗ Current head b376162 differs from pull request most recent head 1af7050

Please upload reports for the commit 1af7050 to get more accurate results.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7475      +/-   ##
============================================
- Coverage     29.36%   24.81%   -4.55%     
============================================
  Files          1177      863     -314     
  Lines        145975   132784   -13191     
  Branches       2871      961    -1910     
============================================
- Hits          42867    32953    -9914     
+ Misses       101423    98877    -2546     
+ Partials       1685      954     -731     

Flag	Coverage Δ
core	?
editoast	72.32% <100.00%> (-0.02%)	⬇️
front	9.79% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	84.29% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[bougue-pe]

Thanks !