Fixed exception type to SQLFeatureNotSupported

[machavan]

Fixed exception type to SQLfeatureNotSupported as per the the java.sql.Connection API doc: https://docs.oracle.com/javase/8/docs/api/java/sql/Connection.html#releaseSavepoint-java.sql.Savepoint-

Testing:

• Build and unit tests pass
• Added new unit test for testing this exception

[lilgreenbird]

/azp run public-mssql-jdbc.windows

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[machavan]

/azp run public-mssql-jdbc.linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[machavan]

/azp run CI-MacOS

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.15%. Comparing base (5bb3353) to head (0bb9238).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2583      +/-   ##
============================================
+ Coverage     51.01%   51.15%   +0.14%     
- Complexity     3921     3933      +12     
============================================
  Files           147      147              
  Lines         33483    33506      +23     
  Branches       5609     5614       +5     
============================================
+ Hits          17081    17141      +60     
+ Misses        13991    13954      -37     
  Partials       2411     2411              

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