[BUGFIX] Fix false positive test in TimeTrackerTest

The test `getParseTimeReturnsTotalParseTimeInMilliseconds` fails
regularly and needs some improvement.

Resolves: #90730
Releases: master
Change-Id: I9fb0ce30180da03e633c764c33282ddf7fe83f7c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63679


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Benni Mack <benni@typo3.org>