Port #3857 to release/6.1

[apoorvdeshmukh]

Description

Port #3857 to release/6.1
Closes #3845

Issues

#3845

Testing

To be introduced when addressing #3876

Guidelines

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• Contributing
• Code of Conduct
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[Copilot]

Pull request overview

This PR ports a bug fix from PR #3857 to the release/6.1 branch, addressing issue #3845. The fix prevents a potential NullReferenceException when processing batch RPC commands with Always Encrypted enabled.

Changes:

• Added a null check for systemParams before accessing its Length property in the TryFetchInputParameterEncryptionInfo method
• Applied the fix consistently to both .NET Framework and .NET Core implementations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlCommand.cs	Added null check before accessing systemParams.Length in batch RPC mode parameter encryption logic
src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlCommand.cs	Added null check before accessing systemParams.Length in batch RPC mode parameter encryption logic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.64%. Comparing base (a20f10a) to head (cb45256).
⚠️ Report is 1 commits behind head on release/6.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/6.1    #3877      +/-   ##
===============================================
- Coverage        65.42%   63.64%   -1.79%     
===============================================
  Files              279      279              
  Lines            53302    53302              
===============================================
- Hits             34875    33924     -951     
- Misses           18427    19378     +951     

Flag	Coverage Δ
addons	90.82% <ø> (ø)
netcore	67.62% <100.00%> (-0.76%)	⬇️
netfx	67.78% <100.00%> (-1.70%)	⬇️

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