Issue#2550 - Fixed getGeneratedKeys functionality for execute API

[machavan]

Description:

The execute API for INSERT was not reading off the explicit TDS_DONE token that actually contains the update count returned by the server. As a result, it was not able to correctly report back the update count for getUpdateCount and also the subsequent resultsets on getMoreResults.

Note that this works correctly for excecuteUpdate API.

Testing:

• All existing tests pass
• Introduced a number of tests testing various combinations of execute/executeUpdate API, INSERT/UPDATE/DELETE/MERGE DML operations, followed by explicit SELECT statement or getGeneratedKeys call.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 51.37%. Comparing base (08cd6fd) to head (4b5b941).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	50.00%	4 Missing and 3 partials ⚠️
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2554      +/-   ##
============================================
+ Coverage     51.22%   51.37%   +0.14%     
- Complexity     3953     3976      +23     
============================================
  Files           147      147              
  Lines         33657    33664       +7     
  Branches       5624     5626       +2     
============================================
+ Hits          17241    17295      +54     
+ Misses        13999    13936      -63     
- Partials       2417     2433      +16     

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[tkyc]

Internal tests pass

[martinoconnor]

Suggestion: may also wish to verify that the execute API works with SET NOCOUNT ON;

[machavan]

Suggestion: may also wish to verify that the execute API works with SET NOCOUNT ON;

Yes, verified with execute API and added a new test case

[machavan]

ADO pipeline tests passed with the PR.