[5.1] Convert mod_login to service provider

[joomlaweby]

Summary of Changes

Converts the administrator login module to service provider.

Testing Instructions

1. You should see module output in administrator login page

Actual result BEFORE applying this Pull Request

Module works as expected

Expected result AFTER applying this Pull Request

Module works same way as before applying pull request

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

[ceford]

I have tested this item ✅ successfully on 1ac8a37

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[viocassel]

I have tested this item ✅ successfully on 1ac8a37

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[richard67]

RTC

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[richard67]

RTC is still valid as the change after that was just small code style change.

[LadySolveig]

Thank you @joomlaweby 🚀 and also for testing and review @ceford @viocassel @sandewt