Convert privacy plugins to service provider

[laoneo]

Summary of Changes

Converts the media action plugins to service providers.

Testing Instructions

Create some contacts and assign a user to them, then make an export request and export the contact data. Same for content.

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: Update new-deprecations.md for https://github.com/joomla/joomla-cms/pull/40174 Manual#94

• No documentation changes for manual.joomla.org needed

[heelc29]

I have tested this item 🔴 unsuccessfully on 8110a9d

During export data Class "Joomla\Plugin\Privacy\User\Extension\UserPlugin" not found

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[heelc29]

I have tested this item ✅ successfully on 30f4028

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/40174.}

[joomdonation]

I have tested this item ✅ successfully on 30f4028

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/40174.}

[joomdonation]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/40174.}