Support refreshing service connector credentials in the Vertex step operator to support long-running jobs

[stefannica]

Describe changes

When synchronous orchestrators and step operator runs take a long time to complete, the service connector credentials used to poll their status can expire. This PR only addresses this problem for the Vertex step operator by refreshing credentials before they expire and can cause errors. A generic solution that targets all affected orchestrators, step operators and potentially other stack components will be devised in a separate upcoming change request.

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[strickvl]

LGTM assuming you've tested that this works on Sagemaker.

Makes me wonder whether we shouldn't be doing something like this across the board with other orchestrators and/or step operators...

[htahir1]

@stefannica i would also say that we should add this to basically everywhere right?

[stefannica]

@strickvl @htahir1 I decided to make this PR only about the Vertex step operator. I need to think about a generic solution for all other orchestrators/step operators and potentially other stack components that can be linked to service connectors. Implementing individual solutions for each case proved to be very hacky and prone to becoming outdated and buggy over time.