Quick Start: don’t display quick start prompt for self-hosted sites

[momo-ozawa]

Fixes #18547
Fixes #18458

Description

• Quick Start (and the prompt) shouldn't be displayed for self-hosted sites.

How to test

1. Add a self-hosted site
2. ✅ Verify: the quick start prompt is NOT displayed

Simulator.Screen.Recording.-.iPhone.13.-.2022-05-13.at.16.10.32.mp4

Regression Notes

1. Potential unintended areas of impact

• Self-hosted login

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

• Tested manually

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 Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr18608-fde722a 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 pr18608-fde722a on your iPhone

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

[hassaanelgarem]

Works as described 🚀