DBAL-760: [GH-490] Don't return warnings as errors in sqlsrv driver

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of deeky666:

Url: #490

Message:

The SQL Server platforms use sp_rename stored procedure for renaming schema objects like tables, indexes or columns. SQL Server raises a warning when invoking this stored procedure, although the result is as expected:

Doctrine\DBAL\Driver\SQLSrv\SQLSrvException: SQLSTATE [01000, 15477]: [Microsoft][SQL Server Native Client 11.0][SQL Server]Vorsicht: Wenn Sie Teile eines Objektnamens ��ndern, werden Skripts und gespeicherte Prozeduren m��glicherweise funktionsunf��hig.

This PR configures the sqlsrv driver not to handle warnings returned from the server as errors to prevent this. The PDO_SQLSRV driver silences warnings, too.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-490] was closed:
#490

[doctrinebot]

Issue was closed with resolution "Fixed"

[github-actions]

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