Use SIRI-ET and GTFS-RT TripUpates at the same time

[leonardehrenfried]

Summary

Previously it was not possible to run SIRI-ET and GTFS-RT TripUpdates in the same instance. This PR changes it by cleaning up the relationships of the various real-time components.

A class diagram to show the new relationships is available in the issue #6348.

Issue

Closes #6348

Unit tests

Some unit tests updated.

Documentation

The new class diagram is available in this PR in doc/dev/diagrams/TimetableSnapshotManager.svg.

Bumping the serialization version id

While no actual entities have changed, but the TimetableRepository has which is serialized into the graph. Therefore we need to bump it.

cc @fahrplaner

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 12 lines in your changes missing coverage. Please review.

Project coverage is 69.80%. Comparing base (72019c0) to head (ff4b7ae).
Report is 1 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...entripplanner/transit/configure/TransitModule.java	0.00%	5 Missing ⚠️
...ner/standalone/configure/ConstructApplication.java	0.00%	3 Missing ⚠️
...planner/updater/configure/UpdaterConfigurator.java	70.00%	3 Missing ⚠️
...oradapter/transit/mappers/TransitLayerUpdater.java	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6363      +/-   ##
=============================================
+ Coverage      69.79%   69.80%   +0.01%     
+ Complexity     17943    17933      -10     
=============================================
  Files           2046     2046              
  Lines          76685    76645      -40     
  Branches        7829     7825       -4     
=============================================
- Hits           53520    53505      -15     
+ Misses         20423    20401      -22     
+ Partials        2742     2739       -3     

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