fix: added typescript types to fluid multiselect

[riddhybansal]

Closes #17363

• Added Typescript component to Flluid Multiselect and its skeleton state
• Deprecated 'isFilterable' prop
• Added a new component called FluidFilterableMultiselect
• Converted index.js to index.tsx
• Added missing type imports from different components

Testing / Reviewing

• FluidMultiSelect should work as intended.

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[emyarod]

looks good to me!

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 76.98%. Comparing base (5020449) to head (ca168c6).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/components/FluidMultiSelect/FluidMultiSelect.tsx	22.22%	7 Missing ⚠️
...ts/FluidMultiSelect/FluidFilterableMultiSelect.tsx	0.00%	1 Missing ⚠️
...nts/FluidMultiSelect/FluidMultiSelect.Skeleton.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17583      +/-   ##
==========================================
- Coverage   77.03%   76.98%   -0.05%     
==========================================
  Files         408      409       +1     
  Lines       13993    14001       +8     
  Branches     4321     4350      +29     
==========================================
  Hits        10779    10779              
- Misses       3041     3050       +9     
+ Partials      173      172       -1     

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