Do full link selection fix only on 13.0

[SergioEstevao]

Fixes #12626

To test:

• Check the scenario referred in the ticket to see if the bug still happens

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger an installable build for these changes by visiting CircleCI here.

[etoledom]

Works well on iOS 13.1 🎉

Note: Couldn't test on 13.0.

[designsimply]

I tested with develop @ 625c1df8d0 on an iPhone 6S iOS 13.1.3 and couldn't get the app to crash after trying to add, remove, move links including dragging and dropping text with links or just links in the Aztec editor.

[koke]

Sorry I got to this one late, but I'm still not sure about this fix. The original crash was also happening on 13.0, so this won't fix the crash for those users. I still think it's better to avoid the crash (which could lead to content loss in an editor context) rather than avoid a link UX bug.