[6.0] Remove legacy stubs for site component helpers

[Hackwar]

Summary of Changes

Our frontend components contain a bunch of helper files, which have been moved to their namespaced version a long time ago. To keep backwards compatibility in the past, we left small wrapper classes which extended the namespaced version under the original name. This PR removes those stubs now. If you need the helpers, please use the namespaced versions.

Testing Instructions

Codereview?

Link to documentations

Please select:

• [ ] Documentation link for docs.joomla.org:

• [X] No documentation changes for docs.joomla.org needed

• [ ] Pull Request link for manual.joomla.org:

• [ ] No documentation changes for manual.joomla.org needed

[hans2103]

I have tested this item :white_check_mark: successfully on 7995bc93ef6404e29eca8f6ed3c0dddefe158208

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[alikon]

i noticed this

@deprecated 4.3 will be removed in 7.0

can we do it in 6.0 ?

[hans2103]

i noticed this

@deprecated 4.3 will be removed in 7.0

can we do it in 6.0 ?

think not... 6.0 has already been released. Therefor it has to wait until the next major release.