Revert exception thrown when encountering negative A* weight

[leonardehrenfried]

Summary

@vpaturet has reported that the Norwegian graph build fails because I made the A* code throw an exception instead of logging a warning in #7519.

This PR reverts to a log message instead of an exception.

I will fix the problem at the root in a follow up.

Issue

Relates to #7570

Unit tests

Updated.

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.42%. Comparing base (3970345) to head (b0d31ef).
⚠️ Report is 2 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...entripplanner/street/search/state/StateEditor.java	44.44%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #7572   +/-   ##
==========================================
  Coverage      72.42%   72.42%           
- Complexity     21192    21194    +2     
==========================================
  Files           2370     2370           
  Lines          86300    86306    +6     
  Branches        8485     8485           
==========================================
+ Hits           62501    62507    +6     
- Misses         20803    20806    +3     
+ Partials        2996     2993    -3     

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