Fix Databricks sqlalchemy URL construction

[BrianLii]

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Related: #53217

Update DatabricksSqlHook to use _get_token and self.host when constructing the SQLAlchemy URL, replacing the previous reliance on get_conn().

• Remove dependency on get_conn() for retrieving tokens and host.
• Update unit tests to reflect the change.

[BrianLii]

OpenLineage is calling hook.get_sqlalchemy_engine() here, and it stopped working after this changes with error 'Connection' object has no attribute 'password'. The connection I have looks like databricks://@adb-XXX.10.azuredatabricks.net?token=XXX&http_path=/sql/1.0/warehouses/XXX.

@kacpermuda Could you check if this PR works for your scenario? I tested it by replacing the mock create_connection with the URL you provided.

[kacpermuda]

Sure, let me test that and get back with the confirmation

[kacpermuda]

Yeah, looks like it solved the problem in my use case. Thanks !