[Gutenberg] Allow audio upload to premium users after Jetpack features removal

[fluiddot]

This PR fixes a bug where premium users can't upload Audio files after the Jetpack features are removed. The issue was introduced in #19691.

NOTE: The issue addressed in this PR is only affecting the WordPress app as the removal of Jetpack features is only applied in that app.

To test

Preparation:

1. Open the WordPress app.
2. Go to "Debug" screen via "Me -> App Settings" screen.
3. Enable "Jetpack Features Removal Phase Four" (when Jetpack features are removed)

Simple site - Paid plan

1. Go to a Simple site with a paid plan.
2. Open/create a post.
3. Add an Audio block.
4. In the "Choose audio" picker, observe that it displays the following options:

• WordPress Media Library
• Insert from URL
• Other Apps

Simple site - Free site

1. Go to a Simple site with the free plan.
2. Open/create a post.
3. Add an Audio block.
4. In the "Choose audio" picker, observe that it only displays the option "Insert from URL".

Regression Notes

1. Potential unintended areas of impact
   N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N/A

3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr20291-bc82b26 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr20291-bc82b26 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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[geriux]

LGTM! I tested this using the WordPress app following the test cases from the PR description. 🚀