[5.2] Fix | Fix issue with Socket.Connect in managed SNI (#2777)

[JRahnama]

Ports #2777

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.62%. Comparing base (ec5ad66) to head (4b9a0e2).
Report is 2 commits behind head on release/5.2.

Files	Patch %	Lines
...e/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs	57.14%	3 Missing ⚠️
...core/src/Microsoft/Data/SqlClient/SNI/SNICommon.cs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release/5.2    #2779      +/-   ##
===============================================
- Coverage        72.64%   72.62%   -0.02%     
===============================================
  Files              310      310              
  Lines            61881    61930      +49     
===============================================
+ Hits             44953    44977      +24     
- Misses           16928    16953      +25     

Flag	Coverage Δ
addons	92.88% <ø> (ø)
netcore	76.79% <63.63%> (-0.04%)	⬇️
netfx	70.23% <ø> (+<0.01%)	⬆️

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