[6.0] Smart Search: Removing dependency on CMSObject

[Hackwar]

Summary of Changes

The CMSObject class has been deprecated for a long time and for 6.0, we want to remove it as much as possible. This PR removes it from Smart Search.

Testing Instructions

Apply the PR and run the indexer, look at statistics and search in the frontend and see, that everything still works as expected.

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: Documentation for removal of CMSObject from core code Manual#380

• No documentation changes for manual.joomla.org needed

[wilsonge]

Which of these methods are regularly used in smart search plugins? Because we'll need to explicitly call out b/c docs in those with docs.

[Hackwar]

None. The state object normally is only used internally from Smart Search. We've not been using the CMSObject stuff for some time already, at least since 3.10. It's just that no one changed it to a stdClass in time for a major release so far.

[laoneo]

Can you document this change in the manual?

[Bodge-IT]

I have tested this item ✅ successfully on fe77bce

Indexer continued to work after wiped index.

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[QuyTon]

I have tested this item ✅ successfully on 80e60dc

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[QuyTon]

RTC

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