refactor: MultiSelect field

[pateljannat]

1. The MultiSelect field used a Popover, which made the field architecture unnecessarily complex.
2. There were also issues with the way its input field behaved. The input always lost focus when clicked for the first time.
3. Removing an option was also not working anymore

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.65%. Comparing base (5175050) to head (2f1d9a8).
⚠️ Report is 224 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2077      +/-   ##
===========================================
+ Coverage    32.85%   40.65%   +7.80%     
===========================================
  Files          152      149       -3     
  Lines         5108     5276     +168     
===========================================
+ Hits          1678     2145     +467     
+ Misses        3430     3131     -299     

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[cypress]

lms    Run #2047

Run Properties:   Failed #2047  •  49b0c18bcc ℹ️: Merge 2f1d9a8690059b479d8e6f773ba57e77270038ac into 5fc7c52bfe5c7e96018990fe6d20...

Project	lms
Branch Review	issues-182
Run status	Failed #2047
Run duration	01m 57s
Commit	49b0c18bcc ℹ️: Merge 2f1d9a8690059b479d8e6f773ba57e77270038ac into 5fc7c52bfe5c7e96018990fe6d20...
Committer	Jannat Patel
View all properties for this run ↗︎

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Test results
Failures	1
Flaky	0
Pending	0
Skipped	0
Passing	1
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Tests for review