Some tests have to be refactored

[BenjaminQuandt]

Hi,

I added some test back in and got some errors there:

• tx_mktools_tests_hook_GeneralUtilityTest
  opendir(.../typo3-mktools/.Build/Web/typo3temp/rn_base): failed to open dir: No such file or directory

• tx_mktools_tests_scheduler_GenerateRealUrlConfigurationFileTest
  The requested database connection named "Default" has not been configured.

• tx_mktools_tests_util_PageNotFoundHandlingTest
  looks like tx_rnbase::load throws errors that point in a Exception:
  Exception: No extension key found for classname: tx_mktools_tests_fixtures_classes_util_PageNotFoundHandling

• tx_mktools_tests_util_miscToolsTest
  RuntimeException: The requested database connection named "Default" has not been configured.

• tx_mktools_tests_util_ExceptionHandlerTest
  RuntimeException: The requested database connection named "Default" has not been configured

• Later on i had to skip some more test based on a conflict with typo3 9.5
  not found rn_base/Classes/CommandLine/Controller.php
  Uncaught require typo3conf/LocalConfiguration.php failed to open stream: No such file or directory