Fixes ReadAsync() behavior to register Cancellation token action before streaming results

[cheenamalhotra]

Fixes #1065 with test case added from comment.

cc @jnm2 @roji would appreciate some extra validations!

[JRahnama]

/azurepipilines run

[codecov]

Codecov Report

Base: 71.47% // Head: 71.43% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (e79cfa6) compared to base (f62ac3b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1781      +/-   ##
==========================================
- Coverage   71.47%   71.43%   -0.05%     
==========================================
  Files         293      293              
  Lines       61381    61381              
==========================================
- Hits        43872    43846      -26     
- Misses      17509    17535      +26     

Flag	Coverage Δ
addons	92.38% <ø> (ø)
netcore	74.99% <100.00%> (-0.05%)	⬇️
netfx	69.29% <100.00%> (-0.03%)	⬇️

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%> (+0.04%)	⬆️
...etfx/src/Microsoft/Data/SqlClient/SqlDataReader.cs	68.48% <100.00%> (+0.08%)	⬆️
...ata/SqlClient/SqlConnectionTimeoutErrorInternal.cs	41.96% <0.00%> (-9.83%)	⬇️
...Microsoft/Data/ProviderBase/DbConnectionFactory.cs	17.04% <0.00%> (-3.41%)	⬇️
...soft/Data/SqlClient/TdsParserStateObjectManaged.cs	84.02% <0.00%> (-1.39%)	⬇️
...c/Microsoft/Data/SqlClient/SqlConnectionFactory.cs	68.85% <0.00%> (-0.82%)	⬇️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	85.19% <0.00%> (-0.67%)	⬇️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	85.63% <0.00%> (-0.59%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	72.88% <0.00%> (-0.40%)	⬇️
...ient/netfx/src/Microsoft/Data/SqlClient/SqlUtil.cs	58.29% <0.00%> (-0.25%)	⬇️
... and 5 more

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[lcheunglci]

@cheenamalhotra Please backport this to the 5.0.1 as well. Thanks!