Revert "fix(auth): Hosted UI task continuation (#2017)"

[dnys1]

This reverts commit c16e4dd424afcbb91e6b40bd545d8449b1e56d30.

Originally proposed as a fix to #2015 which turned out to be not needed. Async/await provides a much cleaner syntax and is good to gain exposure with.

[codecov-commenter]

Codecov Report

Merging #2027 (396d343) into next (bf8a700) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #2027   +/-   ##
=======================================
  Coverage   43.92%   43.92%           
=======================================
  Files         122      122           
  Lines        7549     7549           
=======================================
  Hits         3316     3316           
  Misses       4233     4233           

Flag	Coverage Δ
android-unit-tests	∅ <ø> (∅)
flutter-unit-tests	26.64% <ø> (ø)
ios-unit-tests	89.08% <ø> (ø)

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