Reset bookmarks sync timestamp after migrating to FFS favorites

[ayoy]

Task/Issue URL: https://app.asana.com/0/0/1205710208879158/f

Description:
After migration to form-factor specific favorites is done, reset the timestamp
of bookmarks syncable model to force full remote data fetch to populate
FFS favorites folders that may have previously been skipped.

Steps to test this PR:

1. Launch the iOS app 1 from Xcode from develop branch.
2. Sign up to Sync.
3. Launch the iOS app 2 (maybe use a simulator and a device) from this branch.
4. Add some favorites to the app 2.
5. Connect app 2 to app 1's Sync account, display form factor specific favorites (default setting).
6. Verify that both apps have the same set of favorites.
7. Delete a favorite on the app 1. Verify that it's not deleted from the app 2 (that displays mobile favorites that were unaffected by a change made on app 1).
8. Run app 1 from this branch.
9. Verify that app 1 displays the previously deleted favorite.

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than '

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 14
• iOS 15
• iOS 16

Theme Testing:

• Light theme
• Dark theme

---

Internal references:

Software Engineering Expectations
Technical Design Template

[bwaresiak]

After removing the app and running it again, I've gor a crash (that disappeared afterwards):

I think syncDataProviders can be nil here.

[ayoy]

After removing the app and running it again, I've gor a crash (that disappeared afterwards):

I think syncDataProviders can be nil here.

Oops, thanks for spotting this! The only thing that comes to my mind is to pass the flag via a local variable in case syncDataProviders was not initialized. It solves the crash FWIW and sets the flag to true as expected. Please have another look. Thanks!

[bwaresiak]

LGTM!