Introduce a UserFactoryAware interface

[laoneo]

Summary of Changes

Adds a new interface and trait to deal with a UserFactory class.

Testing Instructions

• Log in on the back end
• Open a user back end form

Actual result BEFORE applying this Pull Request

All works.

Expected result AFTER applying this Pull Request

All 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:

• No documentation changes for manual.joomla.org needed

[sandewt]

Missing Name in User Actions Log after apply patch.

[laoneo]

Thanks @sandewt for the test. Fixed it in 17cd076

[sandewt]

I have tested this item ✅ successfully on 17cd076

• Log in on the back end
• Open a user back end form

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