fix: Make split panel resizer icon aria-hidden

[avinashbot]

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Description

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 95.40%. Comparing base (dcfb42f) to head (26ac951). Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2252   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files         696      705    +9     
  Lines       18653    18715   +62     
  Branches     6196     6262   +66     
=======================================
+ Hits        17795    17855   +60     
- Misses        804      807    +3     
+ Partials       54       53    -1     

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[avinashbot]

Duplicate of #2285