fix(ingest/sagemaker): ensure consistent STS token usage with refresh mechanism

[sagar-salvi-apptware]

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[skrydal]

Thank you for the contribution. I added some comments with regards to particular lines. Would it be possible to add some unit test proving that refreshing didn't work before and works after the change?

[skrydal]

Thank you for rearranging the code and testing it. I believe it should work as intended now. I am concerned though with sagemaker_client field of the jobs.py losing it's strict type on the way, especially considering isinstance check against it further down the road it might be hard to maintain this class later.

I would suggest to create a "ClientFactory" class, instantiated in SagemakerSource. The factor would be initialized with entire config (so that it can have a logic we now use to provide arguments to the JobProcessor). The JobProcessor would just receive a factory method which it would call to get client, completely oblivious to the fact that the factory method will return:

1. cached credentials if allowed_cred_refresh() returns false (it would hold cache object)
2. or pass along what get_sagemaker_client() method returns in case allowed_cred_refresh() returns true

This way we avoid changes to the type of sagemaker_client (it would be always a function).
I am approving this PR, but if you have time I am interested as to what do you think about proposed change and maybe you would like to try it?