[5.2] CMSPlugin: Deprecate use of DispatcherAware and LanguageAware

[Fedik]

Summary of Changes

Deprecate use of DispatcherAware and LanguageAware within CMSPlugin class.

Plugin should use DispatcherAware it on its own.
And LanguageAware is a leftover from some changes in past, and does not used anywhere (I did not found).

Partial alternative to:

• [5.2] Remove class-level event dispatcher dependency in plugins #39387

Testing Instructions

Code review.
Navigate around the site.
Edit site content.
Use finder indexer.
All should work as before.

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: TBD
• No documentation changes for manual.joomla.org needed