Dispatch failure event for pwd completion error

[joostfarla]

Issue #, if available:
None

Description of changes:
When an error occurs while completing the user's password, no event is dispatched. I've added this event to make it consistent with signIn/signUp to be able to implement a custom UI with proper error feedback.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #694 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #694      +/-   ##
==========================================
+ Coverage   87.28%   87.28%   +<.01%     
==========================================
  Files          72       72              
  Lines        3428     3429       +1     
  Branches      652      652              
==========================================
+ Hits         2992     2993       +1     
  Misses        419      419              
  Partials       17       17

Impacted Files	Coverage Δ
packages/aws-amplify/src/Auth/Auth.ts	88.09% <100%> (+0.01%)	⬆️

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[richardzcode]

👍

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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