Add sync option for getting app on other platforms

[CDRussell]

Task/Issue URL: https://app.asana.com/0/72649045549333/1207997698739756/f

Description

Adds a new view with instructions on how to "Get DuckDuckGo on Other Devices" from the following places inside sync flows:

• sync settings (sync disabled)
• sync set up successfully screen
• sync settings (sync enabled)

Steps to test this PR

When sync is disabled

• With sync disabled, visit Sync & Backup screen; verify you see "Get DuckDuckGo on Other Devices" button
• Tap on it, verify you see the new screen to get or share DDG link

Upon sync set up successfully

• With sync disabled, visit Sync & Backup screen
• Choose to Sync and Back Up This Device and complete sync flow
• On the Your data is synced success screen, verify you see the new "Get DuckDuckGo on Other Devices" secondary button
• Tap on it, verify you see the new screen to get or share DDG link

When sync is enabled

• With sync enabled, visit Sync & Backup screen; verify you see "Get DuckDuckGo on Other Devices" button
• Tap on it, verify you see the new screen to get or share DDG link

Testing the new screen works as expected

• From the new screen to get or share DDG link, tap the Share Download Link button; verify you get a share dialog.
• Choose to share it (e.g., to Messages or Gmail). Verify the message shared contains the link and, when tapped, opens the app download page
• Return to the new screen to get or share DDG link; tap the blue hyperlink; verify the link is copied to the device cliipboard

UI changes

Various places from sync flow where there is a button to get to the new screen

New screen

[CDRussell]

• Pixels around sync promotion #4921
• Add sync option for getting app on other platforms #4895 👈
• Sync promotions UI #4892
• Sync promotion in Passwords and Bookmarks #4891
• develop

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[CDRussell]

Merge activity

• Aug 29, 11:58 AM EDT: @CDRussell started a stack merge that includes this pull request via Graphite.
• Aug 29, 12:17 PM EDT: Graphite rebased this pull request as part of a merge.
• Aug 29, 12:31 PM EDT: @CDRussell merged this pull request with Graphite.