feat: Make file input public

[katiegeorge]

Description

This pulls file input out of internal and into the public folder.

This PR is part one of multiple for file upload decomposition, to make the pull requests easier to review.

Full plan:

• File dropzone (internal)
• File input (internal)
• File token group (internal)
• File dropzone (external)
• File input (external) - this PR
• File token group (external)
• Adding file-upload variant to button group

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (7175cd1) to head (21322b0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2982   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files         769      770    +1     
  Lines       21766    21771    +5     
  Branches     7384     7441   +57     
=======================================
+ Hits        20955    20960    +5     
- Misses        758      803   +45     
+ Partials       53        8   -45     

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[pan-kot]

Let's avoid having deprecated className and id in new components