[Reland] Add flag for not breaking word inside email/url

The previous revert was due to false alarm. (b/355362673)

Bug: 350691716
Change-Id: If5d2fe7f3d6d395c3fe97548f20262923f853afb
Test: minikin_tests
Flag: com.android.text.flags.dont_break_email_in_nobreak_tag