Fix car routing using stations or multi-modal stations as locations

[optionsome]

Summary

Previously we had a coordinate fallback for stops as locations in car searches. This pr adds a similar fallback for stations and multi-modal stations using their coordinate (not child stops').

Issue

Closes #7150

Unit tests

Added tests

Documentation

Not needed

Changelog

From title

[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.13%. Comparing base (9aa668b) to head (13134b8).
⚠️ Report is 1 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...outing/linking/configure/LinkingServiceModule.java	0.00%	3 Missing ⚠️
...planner/routing/linking/LinkingContextFactory.java	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #7151   +/-   ##
==========================================
  Coverage      72.12%   72.13%           
- Complexity     20837    20841    +4     
==========================================
  Files           2268     2268           
  Lines          84338    84353   +15     
  Branches        8415     8417    +2     
==========================================
+ Hits           60827    60844   +17     
+ Misses         20538    20536    -2     
  Partials        2973     2973           

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