Add chopprefix/chopsuffix methods for AbstractChar from PR 59425

[ararslan]

These were added in #59425, during the 1.13 development cycle.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.35%. Comparing base (5bfa166) to head (3c6ad36).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #847      +/-   ##
==========================================
+ Coverage   94.26%   94.35%   +0.09%     
==========================================
  Files           2        2              
  Lines         488      496       +8     
==========================================
+ Hits          460      468       +8     
  Misses         28       28              

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