[6.0] CategoryNode/Changelog: Remove legacy error handling trait

[Hackwar]

Summary of Changes

The LegacyErrorHandlingTrait is part of our legacy error handling, which has been deprecated since Joomla 3.1 already. In an effort to remove this finally from the core, this PR removes the trait from the CategoryNode and Changelog class, since they are NOT used in those classes anyway. This is a b/c break and thus has to go into 6.0.

Testing Instructions

Codereview.

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: Remove LegacyErrorHandlingTrait from CategoryNode & Changelog Manual#386

• No documentation changes for manual.joomla.org needed

[rdeutz]

This needs to be documented in the manual/Release Notes.

[Bodge-IT]

Hi @Hackwar, please can you add the PR for the manual?

[Hackwar]

Done.

[Bodge-IT]

I have tested this item ✅ successfully on f94aec5

Tested multi-cat create/move/copy process. All variants worked.

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[softforge]

I have tested this item ✅ successfully on f94aec5

Tested 6.0 site before and after the patch was added. No change to behaviour

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