[5.2][Events] Use event classes for User plugins

[Fedik]

Pull Request for Issue # .

Summary of Changes

Update user plugins to use SubscriberInterface and an event classes.

Testing Instructions

Check following user plugins should work as before:

contactcreator
joomla
profile
terms
token

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: https://docs.joomla.org/Plugin/Events#User
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: New Event classes Manual#177
• No documentation changes for manual.joomla.org needed

References:

• [5.0][Events] User event classes #41317

[richard67]

Drone failure is not related to this PR.