🐛Source Amazon Seller Partner: fix date format in state message for streams with custom dates formatting

[askarpets]

What

Align dates format in state messages and records for streams with custom dates formatting

How

Apply custom transformation in get_updated_state

Recommended reading order

1. streams.py

🚨 User Impact 🚨

This is NOT a breaking change since these streams don't have active customers on cloud

Pre-merge Actions

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[github-actions]

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[bazarnov]

Please add the example of the input/output to the docstring.