[Release 5.0] Fixes ReadAsync() behavior to register Cancellation token action before streaming results

[cheenamalhotra]

Ports #1781 to 5.0-servicing.

[codecov]

Codecov Report

Base: 65.47% // Head: 71.61% // Increases project coverage by +6.14% 🎉

Coverage data is based on head (2800eeb) compared to base (914caf5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           5.0-servicing    #1785      +/-   ##
=================================================
+ Coverage          65.47%   71.61%   +6.14%     
=================================================
  Files                293      293              
  Lines              61385    61385              
=================================================
+ Hits               40189    43963    +3774     
+ Misses             21196    17422    -3774     

Flag	Coverage Δ
addons	92.38% <ø> (+92.38%)	⬆️
netcore	74.96% <100.00%> (+5.77%)	⬆️
netfx	69.60% <100.00%> (+5.91%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...core/src/Microsoft/Data/SqlClient/SqlDataReader.cs	72.84% <100.00%> (+1.47%)	⬆️
...etfx/src/Microsoft/Data/SqlClient/SqlDataReader.cs	68.91% <100.00%> (+1.83%)	⬆️
...re/src/Microsoft/Data/SqlClient/SNI/SNINpHandle.cs	73.77% <0.00%> (-4.92%)	⬇️
.../src/Microsoft/Data/SqlClient/SNI/SNIMarsHandle.cs	87.89% <0.00%> (-4.49%)	⬇️
...crosoft/Data/ProviderBase/DbReferenceCollection.cs	92.63% <0.00%> (-3.16%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	67.27% <0.00%> (-0.18%)	⬇️
...c/Microsoft/Data/SqlClient/TdsParserStateObject.cs	81.50% <0.00%> (-0.15%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	72.88% <0.00%> (+0.19%)	⬆️
...c/Microsoft/Data/SqlClient/SqlClientEventSource.cs	80.13% <0.00%> (+0.34%)	⬆️
...SqlClient/src/Microsoft/Data/SqlClient/SqlEnums.cs	77.37% <0.00%> (+0.63%)	⬆️
... and 52 more

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