fix: pass through credentials parameters when wrapping the provider

[RossWilliams]

Issue

#6960

Description

Passes through credentials parameter object when wrapping the credential provider

Testing

Minimal reproduction example in linked issue

Additional context

Fixes inadvertent behaviour change. Issue recently rolled out into bundled Lambda runtime.

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

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[RossWilliams]

The types in Smithy-lang/smithy-typescript here could also be tightened to require the first parameter so that it does not get accidentally invoked without passing it in. This is probably important in the aws-sdk-js-v3 codebase that does a lot of layering.

[kuhe]

This looks right as a fix.