Complete removal of SQL 2000 support

[edwardneal]

This finishes the work from #3206 and prior PRs. It removes the Is2005OrNewer and Is2000 properties from SqlCommand, SqlConnection, SqlInternalConnectionSmi, SqlInternalConnectionTds, SqlInternalConnection and TdsParser, then chases those references through the codebase.

I'd appreciate a CI run against this, although I don't think there'll be any surprises here - all of these code paths should be dead.

[paulmedynski]

Looks good - one small change requested.

[paulmedynski]

Can you add braces here, or use null-conditional con?.Dispose() ?

[edwardneal]

Yes - fixed. I've updated the netcore code to keep it in sync.

[paulmedynski]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Attention: Patch coverage is 87.09677% with 8 lines in your changes missing coverage. Please review.

Project coverage is 66.14%. Comparing base (1e59b88) to head (c2fb943).
Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/netfx/src/Microsoft/Data/SqlClient/SqlCommand.cs	37.50%	5 Missing ⚠️
.../netfx/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs	93.33%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (1e59b88) and HEAD (c2fb943). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (1e59b88)	HEAD (c2fb943)
addons	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3217      +/-   ##
==========================================
- Coverage   72.58%   66.14%   -6.44%     
==========================================
  Files         289      282       -7     
  Lines       59503    59203     -300     
==========================================
- Hits        43188    39162    -4026     
- Misses      16315    20041    +3726     

Flag	Coverage Δ
addons	?
netcore	68.87% <100.00%> (-6.26%)	⬇️
netfx	65.13% <86.88%> (-6.07%)	⬇️

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