fix: filterable multiselect readonly state implemented

[Gururajj77]

Closes #17587

read only state for filterable multiselect is implemented

Changelog

New

• added new readOnly prop
• new readOnlyEventHandlers method to handle events during the readOnly state.

Changed

• changes related to readOnly state

Testing / Reviewing

• Go to the 'Filterable' story in the Multiselect component in the deploy preview
• Turn on the readOnly prop and see if it works as expected.

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[preetibansalui]

Looks good, some minor changes only.

[codecov]

Codecov Report

Attention: Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.

Project coverage is 78.94%. Comparing base (e8c7672) to head (ff3ccbf).
Report is 37 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/components/MultiSelect/FilterableMultiSelect.tsx	52.94%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17662      +/-   ##
==========================================
+ Coverage   77.07%   78.94%   +1.86%     
==========================================
  Files         409      408       -1     
  Lines       14021    14034      +13     
  Branches     4355     4356       +1     
==========================================
+ Hits        10807    11079     +272     
+ Misses       3043     2788     -255     
+ Partials      171      167       -4     

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[preetibansalui]

Thanks Guru for the changes, Sorry one minor change again. Otherwise it looks good to me.

[preetibansalui]

We are checking readOnly condition here and in handleMenuChange function both. I don't think it's necessary to have it in both places, as one check would also work same.

[preetibansalui]

Thanks for the changes Guru, Looks Good now.

[tay1orjones]

Looks good to me 👍

@laurenmrice could you do a review as well? Just want to be sure we didn't miss anything design-wise