Port #3857 to release/6.0

[apoorvdeshmukh]

Description

Port #3857 to release/6.0
Closes #3848

Issues

#3848

Testing

Test to be introduced through #3876

Guidelines

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[Copilot]

Pull request overview

This PR ports bug fix #3857 to the release/6.0 branch, addressing issue #3848 by adding a null check before accessing the systemParams.Length property in the TryFetchInputParameterEncryptionInfo method. This prevents a potential NullReferenceException when processing batch RPC commands with Always Encrypted column encryption.

Changes:

• Added null check for systemParams before accessing its Length property in both netfx and netcore 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 for _RPCList[i].systemParams before checking length in parameter encryption metadata fetching logic
src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlCommand.cs	Added null check for _RPCList[i].systemParams before checking length in parameter encryption metadata fetching logic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.50%. Comparing base (cda77d0) to head (9596174).
⚠️ Report is 1 commits behind head on release/6.0.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/6.0    #3878      +/-   ##
===============================================
- Coverage        66.72%   63.50%   -3.23%     
===============================================
  Files              285      285              
  Lines            59160    59160              
===============================================
- Hits             39472    37567    -1905     
- Misses           19688    21593    +1905     

Flag	Coverage Δ
addons	92.58% <ø> (ø)
netcore	67.95% <100.00%> (-4.47%)	⬇️
netfx	64.99% <100.00%> (-0.31%)	⬇️

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