[BUGFIX] Use correct `Configuration` ignore in namespace integrity check

The php namespace integrity check uses a symfony
finder to determine which files should be checked.
The used pattern to ignore extension configuration
folder `Configuration` excluded every file,  which
has `Configuration` in the path or filename.

This change avoids using the nifty magic `exclude()`
finder method and replace it with a more reliable
`notPath()` configuration.

Resolves: #102483
Releases: main, 12.4, 11.5
Change-Id: Ic0ae6eaae736b86412f8a430f11ea5b0a8e9dca9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81925


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>