UI: Update AddAccountOrUserToProject to show a drop down for account & user

[vishesh92]

Description

This PR fixes https://github.com/apache/cloudstack/issues/7216

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] Enhancement (improves an existing feature and functionality)
• [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
• [ ] build/CI

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• [ ] Major
• [x] Minor

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[vishesh92]

@blueorangutan ui

[blueorangutan]

@vishesh92 a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 14.96%. Comparing base (ea9a0f4) to head (db68ab3). Report is 23 commits behind head on 4.19.

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19    #9072      +/-   ##
============================================
- Coverage     14.96%   14.96%   -0.01%     
+ Complexity    10995    10992       -3     
============================================
  Files          5373     5373              
  Lines        469024   469031       +7     
  Branches      58818    60697    +1879     
============================================
- Hits          70197    70187      -10     
- Misses       391056   391074      +18     
+ Partials       7771     7770       -1     

Flag	Coverage Δ
uitests	4.31% <ø> (-0.01%)	:arrow_down:
unittests	15.67% <ø> (-0.01%)	:arrow_down:

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[blueorangutan]

UI build: :heavy_check_mark: Live QA URL: https://qa.cloudstack.cloud/simulator/pr/9072 (QA-JID-339)