TYPO3 12: TYPO3 locking strategy should be used

[3l73]

With TYPO3 9 the path var moved from typo3temp/var to the application root, which matches more the symfony standard.

Additionaly, the path locks was changed into lock.

https://github.com/mia3/crossmedia_fourallportal/blob/7f2542c0fc59a2e312bdd0de836e13235b8be860/Classes/Service/EventExecutionService.php#L516

TYPO3 itself offers functionality for locking, which should be used.

See:

• https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/LockingApi/Index.html

ChangeLogs:

• https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/9.2/Feature-84545-AllowTemporaryFilesToBeStoredOutsideTheDocumentRoot.html
• https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/9.2/Feature-84153-IntroduceAGenericEnvironmentClass.html

[3l73]

The current pull request contains a test to verify the lock baviour based on the TYPO3 locking system.