dvc commit: add skip option (s) to interactive prompt

[Western-1]

Description

This PR adds a skip (s) option to the interactive prompt during dvc commit.
Previously, users could only confirm (y) or abort (n), which cancelled the entire process.
Now, users can skip specific stages while continuing to commit others in the queue.

Implementation details:

• Replaced prompt.confirm with ui.prompt to support multiple choices (y, n, s).
• Added logic to commit function to handle the skip (s) action by continuing the loop.

Related Issue

Fixes #10974

Type of changes

• New feature (non-breaking change which adds functionality)

Checklist

• ❗ I have followed the Contributing to DVC checklist.
• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here: docs: update dvc commit interactive prompt options dvc.org#5501

[codecov]

Codecov Report

❌ Patch coverage is 80.72289% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.00%. Comparing base (2431ec6) to head (ce37c5b).
⚠️ Report is 188 commits behind head on main.

Files with missing lines	Patch %	Lines
dvc/repo/commit.py	46.66%	45 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10976      +/-   ##
==========================================
+ Coverage   90.68%   91.00%   +0.31%     
==========================================
  Files         504      505       +1     
  Lines       39795    41108    +1313     
  Branches     3141     3258     +117     
==========================================
+ Hits        36087    37409    +1322     
- Misses       3042     3062      +20     
+ Partials      666      637      -29     

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