Can't configure AssumeRoleProvider to use the FIPS endpoints

[jdisanti]

There's an issue in aws-config where the AWS_USE_FIPS_ENDPOINT environment variable isn't respected for the AssumeRoleProvider, and the ConfigLoader::use_fips value doesn't flow into the AssumeRoleProvider.

Discussed in #880

^{Originally posted by jszwedko August 25, 2023}
This came up through an issue report on Vector about it not using the FIPS endpoints when AWS_USE_FIPS_ENDPOINT=true.

[alex-rowe]

@jdisanti does this need to be raised in smithy-rs instead?

[jdisanti]

We try to track SDK issues in this repo, although sometimes they end up in smithy-rs.

[github-actions]

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