FEAT: Remove invalid DATABASE requirement check in bulk copy

[Copilot]

Work Item / Issue Reference

GitHub Issue: #442

Summary

DATABASE is optional in ODBC connection strings — omitting it causes the server to use the client's default database, which is valid behavior. The _bulkcopy method was incorrectly rejecting such connection strings with a hard error, while regular ODBC connections using the same string worked fine.

Changes

• mssql_python/cursor.py: Removed the ValueError guard that blocked bulk copy when DATABASE was absent from the connection string.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Invalid check for database in connection string in _bulkcopy</issue_title>
<issue_description>### Describe the bug
A clear and concise description of what the bug is.

If you are seeing an exception, include the full exceptions details (message and stack trace).

The database keyword in connection string is optional. In its absence the client sends an empty database name and server responds with the database which the client was connected to. This default DB has been master.

In _bulkcopy we have a check to error out if the DATABASE in the connection string is not specified.

https://github.com/microsoft/mssql-python/blame/f8a6ca130e80d7180395e0e20a1c01e11641f38a/mssql_python/cursor.py#L2630C9-L2634C14

This needs to be removed.

The impact is that a connection string without database (though rare but possible), allows an ODBC connection, but the same connection string wont allow a bulk copy operation.

Please remove this check.</issue_description>

<agent_instructions>Take a look at the issue description and then delete the lines in the file that the issue calls out.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Invalid check for database in connection string in _bulkcopy #442

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