Fix | Addressing regression from removing NETSTANDARD2.1 constant

[JRahnama]

Built-in constant is added to replace the removed defined constant.

[codecov]

Codecov Report

Base: 70.61% // Head: 70.34% // Decreases project coverage by -0.27% ⚠️

Coverage data is based on head (439eaff) compared to base (22eb6c7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1867      +/-   ##
==========================================
- Coverage   70.61%   70.34%   -0.28%     
==========================================
  Files         292      292              
  Lines       61727    61727              
==========================================
- Hits        43591    43419     -172     
- Misses      18136    18308     +172     

Flag	Coverage Δ
addons	92.38% <ø> (ø)
netcore	73.50% <ø> (-0.62%)	⬇️
netfx	69.20% <ø> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
...c/Microsoft/Data/SqlClient/TdsParserStateObject.cs	23.30% <0.00%> (-21.08%)	⬇️
...ata/SqlClient/SqlConnectionTimeoutErrorInternal.cs	41.96% <0.00%> (-18.75%)	⬇️
...c/Microsoft/Data/SqlClient/SqlConnectionFactory.cs	68.85% <0.00%> (-0.82%)	⬇️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	85.19% <0.00%> (-0.67%)	⬇️
...c/Microsoft/Data/SqlClient/TdsParserStateObject.cs	66.46% <0.00%> (-0.52%)	⬇️
...nt/netcore/src/Microsoft/Data/SqlClient/SqlUtil.cs	48.90% <0.00%> (-0.48%)	⬇️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	86.21% <0.00%> (-0.30%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	67.80% <0.00%> (-0.27%)	⬇️
...netcore/src/Microsoft/Data/SqlClient/SqlCommand.cs	83.99% <0.00%> (+0.10%)	⬆️
...nt/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs	71.15% <0.00%> (+0.30%)	⬆️
... and 7 more

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