[TASK] Move VerifyDenyPattern functionality into separate logic

This change targets a couple of things:
- The global constant "FILE_DENY_PATTERN_DEFAULT" is moved to a class constant
- The global constant "PHP_EXTENSIONS_DEFAULT" which is not in use anymore, is removed.
- The security aspect of checking against the fileDenyPattern is extracted into its own
Class where
- The fileDenyPattern can never be empty, but only be set via DefaultConfiguration.

This makes it easier to test this functionality, a single object is taking over the responsibility, and the logic is now in one place. Also, the non-usage of the global constant makes life easier.

Resolves: #90147
Releases: master
Change-Id: I9db0d6fc3b10f75a3735017cb9ac0d9bfd4ff02b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62843


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>