Improve timeout of tests

[MichelZ]

AI Blurp

This pull request includes changes to improve the reliability of connection tests by adjusting connection timeouts. The most important changes include setting a minimum connection timeout in the ConversionTests and EventCounterTest classes.

Improvements to connection tests:

• src/Microsoft.Data.SqlClient/tests/ManualTests/AlwaysEncrypted/ConversionTests.cs: Adjusted the connection timeout to a minimum of 30 seconds in the public ConversionTests() method to reduce the likelihood of connection timeouts during tests.
• src/Microsoft.Data.SqlClient/tests/ManualTests/TracingTests/EventCounterTest.cs: Added a minimum connection timeout of 30 seconds in the public void EventCounter_ReclaimedConnectionsCounter_Functional() method to ensure consistent test execution.

Description

There are quite a few test failures on these methods:
https://sqlclientdrivers.visualstudio.com/public/_test/analytics?definitionId=1879&contextType=build

Many of the failures are timeouts, so I'm trying to see if increasing the timeout a bit could help make these tests more stable

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.71%. Comparing base (b1f7eaf) to head (a063ec4).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3026      +/-   ##
==========================================
+ Coverage   72.68%   72.71%   +0.02%     
==========================================
  Files         285      285              
  Lines       59155    59160       +5     
==========================================
+ Hits        42998    43017      +19     
+ Misses      16157    16143      -14     

Flag	Coverage Δ
addons	92.58% <ø> (ø)
netcore	75.44% <ø> (+0.05%)	⬆️
netfx	71.13% <ø> (+<0.01%)	⬆️

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