Adding fixes for get rows out of bounds.

[aasimkhan30]

Pull Request Template – vscode-mssql

Description

While I was not able to repo this issue, I am adding more guardrails around the getRows code so it doesn't lead to negative row fetches.

This also adds debouncing when scrolling through tables so that we don't spam sts with too many requests and also adding checks so that cell values don't keep fluctuating as we try to update from state results.

Fixes: #20283

Before:

Fixed:

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (npm run test)
• Code follows contributing guidelines
• Telemetry/logging updated if relevant
• No regressions or UX breakage

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[github-actions]

PR Changes

Category	Target Branch	PR Branch	Difference
Code Coverage	55.93%	55.72%	⚪ 0.00%
VSIX Size	4859 KB	4857 KB	⚪ -2 KB ( 0% )
Webview Bundle Size	4008 KB	4012 KB	⚪ 4 KB ( 0% )

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.83%. Comparing base (f0b8470) to head (4881593).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20307   +/-   ##
=======================================
  Coverage   53.83%   53.83%           
=======================================
  Files         198      198           
  Lines       17318    17318           
  Branches     1155     1155           
=======================================
  Hits         9323     9323           
  Misses       7995     7995           

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