Merge common code base for DBReferenceCollection

[JRahnama]

Addresses DbReferenceCollection for #1261

[codecov]

Codecov Report

Attention: Patch coverage is 96.84211% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 66.80%. Comparing base (769b982) to head (34805b4).
Report is 4 commits behind head on main.

❗ Current head 34805b4 differs from pull request most recent head 04eb9db. Consider uploading reports for the commit 04eb9db to get more accurate results

Files	Patch %	Lines
...crosoft/Data/ProviderBase/DbReferenceCollection.cs	96.84%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2403      +/-   ##
==========================================
- Coverage   72.71%   66.80%   -5.91%     
==========================================
  Files         310      303       -7     
  Lines       61885    61481     -404     
==========================================
- Hits        44997    41070    -3927     
- Misses      16888    20411    +3523     

Flag	Coverage Δ
addons	∅ <ø> (∅)
netcore	71.01% <96.84%> (-5.90%)	⬇️
netfx	64.67% <95.78%> (-5.58%)	⬇️

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[DavoudEshtehari]

Nice job! Just make sure not to leave any unused files behind.

[David-Engel]

Shouldn't this be deleting https://github.com/dotnet/SqlClient/blob/main/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/ProviderBase/DbReferenceCollection.cs
and
https://github.com/dotnet/SqlClient/blob/main/src/Microsoft.Data.SqlClient/netcore/src/Common/src/Microsoft/Data/ProviderBase/DbReferenceCollection.cs
?

[JRahnama]

Shouldn't this be deleting https://github.com/dotnet/SqlClient/blob/main/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/ProviderBase/DbReferenceCollection.cs and https://github.com/dotnet/SqlClient/blob/main/src/Microsoft.Data.SqlClient/netcore/src/Common/src/Microsoft/Data/ProviderBase/DbReferenceCollection.cs ?

done. Thanks.

[JRahnama]

/azp run

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