[TASK] Fix definition availability checks in DI compiler passes

findDefinition() doesn't actually return a boolean (or null)
value on failure but throws an exception instead. As an alternative
$container->hasDefintion may be used to check for definition availability.

Also adapt the corresponding dashboard test.

Executed commands:

  Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Resolves: #96703
Releases main, 11.5
Change-Id: Iab7b9ce098daf685c258f428a4aa241cb0411504
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73244


Tested-by: Benjamin Franzke <bfr@qbus.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>