WIP: Bugfix projections with deadlock subscription behaviour

[mhsdesign]

Introduces a basic ProjectionWithDeadlockTest to further test behaviour in exceptional cases when transaction seems to timeout

The test is currently wayy to slow and must be improved by causing a timeout faster.

This is done to investigate into a bug where the graph projection failed to catchup a ContentStreamWasForked event:

Failed to insert hierarchy relation: An exception occurred while executing a query: SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction

At

neos-development-collection/Neos.ContentGraph.DoctrineDbalAdapter/src/DoctrineDbalContentGraphProjection.php

Line 244 in b1168c4

throw new \RuntimeException(sprintf('Failed to insert hierarchy relation: %s', $e->getMessage()), 1716489211, $e);

(see slack)

[mhsdesign]

It keeps the ci busy 🙈 -> lol where is the timeout!!!??!