Code Health | Improve TdsParser

[DavoudEshtehari]

• plus code cleanup

[codecov]

Codecov Report

Patch coverage: 87.37% and project coverage change: -0.92 ⚠️

Comparison is base (2b31810) 70.79% compared to head (bafc8ae) 69.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2071      +/-   ##
==========================================
- Coverage   70.79%   69.87%   -0.92%     
==========================================
  Files         305      305              
  Lines       61819    61829      +10     
==========================================
- Hits        43764    43203     -561     
- Misses      18055    18626     +571     

Flag	Coverage Δ
addons	92.88% <ø> (ø)
netcore	73.33% <97.87%> (-0.19%)	⬇️
netfx	68.12% <78.57%> (-1.30%)	⬇️

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Impacted Files	Coverage Δ
...nt/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs	70.91% <78.57%> (-0.34%)	⬇️
.../netcore/src/Microsoft/Data/SqlClient/TdsParser.cs	68.24% <97.87%> (-0.35%)	⬇️

... and 18 files with indirect coverage changes

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