[5.3] 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).

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: CMSPlugin: Deprecate use of DispatcherAware and LanguageAware Manual#419
• No documentation changes for manual.joomla.org needed

Linked:

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

[HLeithner]

This pull request has been automatically rebased to 5.3-dev.

[softforge]

I have tested this item ✅ successfully on 32f8a00

All the things listed and more work as expected after applying

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[komalm]

I have tested this item ✅ successfully on 32f8a00

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43430.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43430.}

[HLeithner]

@rdeutz is something wrong with this pr or what's the reason that the corresponding manual pr has not been merged? Please revert the pr if it's wrong or merge the manual pr. thanks

[Fedik]

the corresponding manual pr has not been merged?

I made it later, and forgot to ping @rdeutz
Sorry