Move to Shared - SqlTransaction

[Kaur-Parminder]

This is part of #1261 Code merge effort. Move the common code to shared folder and to avoid complicated if defs just kept major feature commit, save, rollback in netcore and netfx files.

[DavoudEshtehari]

Could you move the SqlTransaction.netcore and SqlTransaction.netfx files back into their project's hierarchy?

[codecov]

Codecov Report

Merging #1353 (2f9cfdd) into main (9b1996a) will decrease coverage by 0.12%.
The diff coverage is 73.17%.

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
- Coverage   71.40%   71.28%   -0.13%     
==========================================
  Files         295      296       +1     
  Lines       61195    61161      -34     
==========================================
- Hits        43697    43598      -99     
- Misses      17498    17563      +65     

Flag	Coverage Δ
addons	92.38% <ø> (ø)
netcore	74.77% <75.00%> (-0.19%)	⬇️
netfx	69.17% <72.50%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
...tfx/src/Microsoft/Data/SqlClient/SqlTransaction.cs	55.20% <0.00%> (-3.19%)	⬇️
.../Microsoft/Data/SqlClient/SqlTransaction.Common.cs	74.35% <74.35%> (ø)
...ore/src/Microsoft/Data/SqlClient/SqlTransaction.cs	90.00% <100.00%> (+6.19%)	⬆️
...src/Microsoft/Data/SqlClient/SqlMetadataFactory.cs	81.66% <0.00%> (-10.84%)	⬇️
...ActiveDirectoryAuthenticationTimeoutRetryHelper.cs	56.81% <0.00%> (-6.82%)	⬇️
...rc/Microsoft/Data/SqlClient/SQLFallbackDNSCache.cs	90.62% <0.00%> (-6.25%)	⬇️
...re/src/Microsoft/Data/SqlClient/SNI/SNINpHandle.cs	73.29% <0.00%> (-5.12%)	⬇️
...soft/Data/SqlClient/TdsParserStateObjectManaged.cs	83.91% <0.00%> (-3.01%)	⬇️
...e/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs	59.01% <0.00%> (-2.46%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	67.24% <0.00%> (-0.73%)	⬇️
... and 16 more

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