fix: SQL stager and Snowflake uploader

[mpolomdeepsense]

SQL stager error

When passed output_filename without a suffix it resulted in unsupported file format error. The fix adds .json suffix, if the filename doesn't have one already.

NOTE: Originally discovered in stager plugin. Output filename is passed without suffix.

controller   | handle: <Handle JobInvoker.process_in_pool.<locals>._done_callback(<Task finishe...1cb266fc081')>) at /home/controller/invoker/job_invoker.py:480>
controller   | Traceback (most recent call last):
controller   |   File "/usr/lib/python3.12/asyncio/events.py", line 88, in _run
controller   |     self._context.run(self._callback, *self._args)
controller   |   File "/home/controller/invoker/job_invoker.py", line 484, in _done_callback
controller   |     fut.result()
controller   |   File "/home/controller/invoker/job_invoker.py", line 457, in process_record
controller   |     raise e
controller   |   File "/home/controller/invoker/job_invoker.py", line 451, in process_record
controller   |     await self._process_record(record=record)
controller   |   File "/home/controller/invoker/job_invoker.py", line 421, in _process_record
controller   |     res = await self.invoke_plugin(inputs=job_inputs, record_ids=[record_id])
controller   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
controller   |   File "/home/controller/invoker/job_invoker.py", line 203, in invoke_plugin
controller   |     raise PluginError(
controller   | controller.invoker.base_invoker.PluginError: PluginError: failed to invoke plugin: [ValueError] Unsupported output format: /home/data/stager/71cb266fc081

Snowflake uploader error

Unexpected columns argument was passed to _fit_to_schema method inside SnowflakeUploader upload_dataframe method.

2025-01-17 13:34:21,438 SpawnPoolWorker-11 ERROR    Exception raised while running upload
Traceback (most recent call last):
  File "/home/marek/unstructured/unstructured-ingest/unstructured_ingest/v2/pipeline/interfaces.py", line 171, in run_async
    return await self._run_async(fn=fn, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/marek/unstructured/unstructured-ingest/unstructured_ingest/v2/pipeline/steps/upload.py", line 53, in _run_async
    fn(**fn_kwargs)
  File "/home/marek/unstructured/unstructured-ingest/unstructured_ingest/v2/processes/connectors/sql/sql.py", line 451, in run
    self.upload_dataframe(df=df, file_data=file_data)
  File "/home/marek/unstructured/unstructured-ingest/unstructured_ingest/v2/processes/connectors/sql/snowflake.py", line 173, in upload_dataframe
    self._fit_to_schema(df=df, columns=self.get_table_columns())
TypeError: SQLUploader._fit_to_schema() got an unexpected keyword argument 'columns'