Optimize core memory usage

[flomonster]

This PR removes switch branches (fake edge inside a switch) from the routeOnEdges multimap.
This can reduce the storage of an infra by 200MB.

[codecov]

Codecov Report

Merging #3850 (ae800bd) into dev (d7e3bd7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head ae800bd differs from pull request most recent head 1f4831b. Consider uploading reports for the commit 1f4831b to get more accurate results

@@            Coverage Diff            @@
##                dev    #3850   +/-   ##
=========================================
  Coverage     69.61%   69.62%           
+ Complexity     2017     2003   -14     
=========================================
  Files           438      439    +1     
  Lines         22052    22022   -30     
  Branches       1662     1661    -1     
=========================================
- Hits          15352    15332   -20     
+ Misses         5906     5892   -14     
- Partials        794      798    +4     

Flag	Coverage Δ
core	78.85% <100.00%> (-0.34%)	⬇️

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

Impacted Files	Coverage Δ
...srd/api/pathfinding/PathfindingRoutesEndpoint.java	88.42% <ø> (-0.05%)	⬇️
...mentation/reservation/ReservationInfraBuilder.java	87.01% <100.00%> (+0.08%)	⬆️

... and 32 files with indirect coverage changes

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