Readline multiline completer

[Han5991]

Fixes: #60952

Reset prevRows for multiline prompts during tab completion so the refresh doesn’t wipe the completion list, and add a regression test
that simulates a multiline prompt to verify completions remain visible

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (81e05e1) to head (e81bf43).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60981      +/-   ##
==========================================
- Coverage   88.53%   88.52%   -0.02%     
==========================================
  Files         703      703              
  Lines      208538   208541       +3     
  Branches    40224    40214      -10     
==========================================
- Hits       184629   184607      -22     
- Misses      15912    15953      +41     
+ Partials     7997     7981      -16     

Files with missing lines	Coverage Δ
lib/internal/readline/interface.js	97.35% <100.00%> (+<0.01%)	⬆️

... and 31 files with indirect coverage changes

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