[6.0] Disable tests that require additional user permissions for testing with managed instance

[apoorvdeshmukh]

Description

Following tests require additional user permissions

• ConnectionResiliencySPIDTest
• MARS tests

Issues

AB#41375

Testing

Tests will be enabled again once the require permissions are granted on the test user through #3880.

Guidelines

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• Contributing
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[Copilot]

Pull request overview

This PR temporarily disables tests that require additional user permissions when running against Azure SQL Managed Instance. The tests query system views (sys.dm_exec_connections) and execute admin commands (KILL) that the current test user doesn't have permissions for on Managed Instance. The tests will be re-enabled once the necessary permissions are granted per issue #3880.

Changes:

• Added IsNotManagedInstance() helper method to DataTestUtility class
• Updated 6 MARS test methods to skip execution on Managed Instance
• Updated ConnectionResiliencySPIDTest to skip execution on Managed Instance

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Microsoft.Data.SqlClient/tests/ManualTests/DataCommon/DataTestUtility.cs	Added IsNotManagedInstance() helper method following the existing pattern used for IsNotAzureSynapse()
src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/MARSSessionPoolingTest/MARSSessionPoolingTest.cs	Added IsNotManagedInstance condition to 6 MARS test methods that query sys.dm_exec_connections
src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectivityTests/ConnectivityTest.cs	Added IsNotManagedInstance condition to ConnectionResiliencySPIDTest which uses the KILL command

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.50%. Comparing base (cda77d0) to head (46f6f2c).
⚠️ Report is 3 commits behind head on release/6.0.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/6.0    #3882      +/-   ##
===============================================
- 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	67.97% <ø> (-4.45%)	⬇️
netfx	64.97% <ø> (-0.33%)	⬇️

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