Fix | Add thread safety with transient error list on configurable retry logic

[DavoudEshtehari]

Implementing the IEnumerable<T> doesn't guarantee thread safety, which would end to an inaccurate result under some circumstances.

• This fix addresses intermittent failures on the pipeline with ConcurrentExecution test.

[codecov]

Codecov Report

Base: 70.66% // Head: 70.23% // Decreases project coverage by -0.43% ⚠️

Coverage data is based on head (26d297a) compared to base (f046489).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1882      +/-   ##
==========================================
- Coverage   70.66%   70.23%   -0.44%     
==========================================
  Files         292      292              
  Lines       61728    61732       +4     
==========================================
- Hits        43619    43356     -263     
- Misses      18109    18376     +267     

Flag	Coverage Δ
addons	92.38% <ø> (ø)
netcore	73.43% <100.00%> (-0.71%)	⬇️
netfx	69.09% <100.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
...lClient/Reliability/SqlConfigurableRetryFactory.cs	100.00% <100.00%> (ø)
...c/Microsoft/Data/SqlClient/TdsParserStateObject.cs	23.30% <0.00%> (-20.99%)	⬇️
...ata/SqlClient/SqlConnectionTimeoutErrorInternal.cs	44.64% <0.00%> (-7.15%)	⬇️
...c/Microsoft/Data/SqlClient/TdsParserStateObject.cs	66.11% <0.00%> (-0.78%)	⬇️
...nt/netcore/src/Microsoft/Data/SqlClient/SqlUtil.cs	48.90% <0.00%> (-0.63%)	⬇️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	85.63% <0.00%> (-0.59%)	⬇️
...ient/netfx/src/Microsoft/Data/SqlClient/SqlUtil.cs	57.38% <0.00%> (-0.25%)	⬇️
.../netcore/src/Microsoft/Data/SqlClient/TdsParser.cs	73.37% <0.00%> (-0.11%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	73.64% <0.00%> (-0.10%)	⬇️
...t/netfx/src/Microsoft/Data/SqlClient/SqlCommand.cs	73.54% <0.00%> (-0.07%)	⬇️
... and 1 more

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