test(nested-clients): add defaultProvider assertion

[kuhe]

Issue

n/a

Description

I noticed that the custom rewrite of the nested STS client removes the credentialDefaultProvider. Because that is a critical element of the nested client, I'm adding this unit test as an early detection.

It's possible that a regression here would be detected by our other tests, such as credentials integration, but this small additional test won't hurt.

Checklist

• [n/a] If the PR is a feature, add integration tests (*.integ.spec.ts).
• [n/a] If you wrote E2E tests, are they resilient to concurrent I/O?
• [n/a] If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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