Fix: Do not use deprecated Doctrine\ORM\EntityManager::create()

[localheinz]

This pull request

• stops using the deprecated Doctrine\ORM\EntityManager::create()

Blocks #1293.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@c9b76d6). Click here to learn what that means.

❗ Current head f096375 differs from pull request most recent head 1a838f0. Consider uploading reports for the commit 1a838f0 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1297   +/-   ##
=======================================
  Coverage        ?   99.20%           
  Complexity      ?      105           
=======================================
  Files           ?       25           
  Lines           ?      379           
  Branches        ?        0           
=======================================
  Hits            ?      376           
  Misses          ?        3           
  Partials        ?        0           

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