refactor(cli/unstable): dedupe logic between promptSelect and promptMultipleSelect

[crowlKats]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.28507% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.17%. Comparing base (4db142b) to head (40bb921).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cli/_prompt_select.ts	97.85%	3 Missing ⚠️
cli/unstable_prompt_multiple_select.ts	93.18%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6769      +/-   ##
==========================================
+ Coverage   94.15%   94.17%   +0.01%     
==========================================
  Files         587      588       +1     
  Lines       42514    42496      -18     
  Branches     6712     6699      -13     
==========================================
- Hits        40030    40020      -10     
+ Misses       2433     2426       -7     
+ Partials       51       50       -1     

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[kt3k]

LGTM 👍