[Jetpack] Reader -> Site search: Add Jetpack banner

[twstokes]

Fixes #19129

To test:

Regression Notes

1. Potential unintended areas of impact

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

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

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 Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19166-2414020 on your iPhone

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

[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 pr19166-2414020 on your iPhone

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

[twstokes]

TODO: After fixing the merge conflict, attach the overlay presentation action as noted here.

[twstokes]

TODO: After fixing the merge conflict, attach the overlay presentation action as noted here.

Done. The action already worked because this view uses the JP banner VC wrapper. 🎉