Jetpack Focus: Introduce new Static Screens phase

[hassaanelgarem]

Closes #20329

Description

This PR introduces a new "Static Screens" phase. Some aspects of the phase are implemented, but the main tasks of showing static screens in Stats, Reader, and Notifications are yet to come.

Testing Instructions

1. Install the WordPress app
2. From the debug menu, enable the "Jetpack Features Removal Static Screens Phase" feature flag
3. Go back to My Site
4. Close and reopen the app
5. Make sure that the dashboard is not available
6. Make sure that the tab bar is available and Stats, Reader, and Notifications are accessible
7. Make sure that Sub-features like Activity Log are accessible
8. Make sure that no cards are added to the menu
9. Try creating a site, make sure that the flow is disabled and you're shown an overlay pointing to the Jetpack app
10. Add a Stats widget to your home screen
11. Tap the widget
12. Make sure the app opens, but an overlay is not displayed
13. Open the editor, and make sure that JP-powered blocks are not available (Check [Gutenberg] Disable editor Jetpack-powered features based on Jetpack Features Removal phases #19691 for a full list)

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 pr20331-bff2237 on your iPhone

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

[momo-ozawa]

Works as described!

[dvdchr]

The CI build failed. Rebuilding...

[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 pr20331-bff2237 on your iPhone

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

[dvdchr]

Tested and verified that it works as described. LGTM!

[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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