Adding move of CMS filesystem package to compat plugin

[Hackwar]

User description

This is the documentation PR to joomla/joomla-cms#44240

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PR Type

Documentation

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Description

• Documented the move of the CMS Filesystem package to the compat plugin.

• Provided details on deprecation and future removal in Joomla 7.0.

• Included guidance on using the framework Filesystem package as a replacement.

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Added documentation for CMS Filesystem package move            migrations/54-60/removed-backward-incompatibility.md Added a section about the CMS Filesystem package move. Explained deprecation and future removal in Joomla 7.0. Provided replacement guidance with framework Filesystem package. +9/-0

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