fix: the display of username suggestions

[khudym]

Description

Username suggestions functionality has been corrected to ensure proper behaviour.

• fixed issue with suggestions being displayed in the wrong place;
• added the ability to navigate through suggestions using the keyboard.

Related Pull Requests
PR to the open-release/redwood.master branch: #1279
PR to the open-release/quince.master branch: #1278

Steps to Reproduce:

1. suggestions being displayed in the wrong place

Open register page -> Enter some string into field "Full name" (e.g. Jack Smith) -> Click on field "Public username"

suggestions_rendering_bug.mov

2. impossible to enter suggestions field using the keyboard

Open register page -> Enter some string into field "Full name" (e.g. Jack Smith) -> press Tab button until you get to the "Public username" field

suggestions_keyboard.mov

After changes:

1. suggestions being displayed in the wrong place

fixed_suggestions_rendering_bug.mov

2. impossible to enter suggestions field using the keyboard

fixed_suggestions_keyboard.mov

Merge Checklist

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Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/2u-vanguards to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[openedx-webhooks]

Thanks for the pull request, @khudym!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.69%. Comparing base (e2a206c) to head (e39d41f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1270   +/-   ##
=======================================
  Coverage   87.69%   87.69%           
=======================================
  Files         124      124           
  Lines        2299     2300    +1     
  Branches      642      643    +1     
=======================================
+ Hits         2016     2017    +1     
  Misses        274      274           
  Partials        9        9           

☔ View full report in Codecov by Sentry.
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[mphilbrick211]

Friendly follow-up on this, @openedx/2u-vanguards. Thanks!

[mphilbrick211]

Hi @openedx/vanguards @openedx/2u-vanguards! I think you are still maintainers of this repo. Just checking in to see if someone could please take a look here?