chore: Adds disabled state to file input and file token group components

[orangevolon]

Description

Adds disabled state to two components:

• File input
• File token group

Note on file token group: This component already has a similar property of readOnly which completely removes the dismiss button. The only difference between readOnly and disabled is that disabled keeps the dismiss button but disables it.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov[bot]]

Codecov Report

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

Project coverage is 96.62%. Comparing base (7fbd0fb) to head (54a37e7).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3659    +/-   ##
========================================
  Coverage   96.62%   96.62%            
========================================
  Files         817      817            
  Lines       23782    23784     +2     
  Branches     8269     7914   -355     
========================================
+ Hits        22979    22981     +2     
- Misses        749      796    +47     
+ Partials       54        7    -47     

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