Standardize credential process output

[aBurmeseDev]

Per customers request here to use stderr for prompts, will SDks team consider to standardize credential_process outputs across implementations and not be reliant on the details of mapping inputs/outputs of processes as proposed here?

[tim-finnigan]

Related PRs:

• Remove redirection of stderr when calling credential_process boto/botocore#2091
• Allow stderr passthrough for credential_process boto/botocore#1835
• #1348 - map subprocess stderr to caller stderr boto/botocore#1349

[tim-finnigan]

Reopening original issue (boto/botocore#1348) for tracking going forward.

[github-actions]

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