[6.0] Deleting CMS Filesystem Package

[Hackwar]

Summary of Changes

This PR removes the CMS Filesystem package. You can use the Joomla framework Filesystem package as a drop-in replacement.

This PR depends on several other PRs to remove the cores dependencies on these classes:

• [ ] #43359: File::makesafe()
• [ ] #43958: Folder to framework
• [ ] #43362: Rest of File to framework

Link to documentations

Please select:

• [ ] Documentation link for docs.joomla.org:

• [X] No documentation changes for docs.joomla.org needed

• [ ] Pull Request link for manual.joomla.org:

• [ ] No documentation changes for manual.joomla.org needed