fix: allow text in read-only components to be selected

[TrevorBurnham]

Fixes #4411

This PR modifies the styles on DateRangePicker, FileTokenGroup, Select and Multiselect to make text selectable.

Testing

I've added a read-only toggle to the demo pages and was able to manually test each of these.

• Changes are covered with new/existing unit tests? No
• Changes are covered with new/existing integration tests? No

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.38%. Comparing base (7029006) to head (8de254f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4417   +/-   ##
=======================================
  Coverage   97.38%   97.38%           
=======================================
  Files         928      928           
  Lines       29200    29200           
  Branches    10565    10564    -1     
=======================================
  Hits        28435    28435           
- Misses        718      759   +41     
+ Partials       47        6   -41     

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