Make Partial Creds a Transient Error

[waahm7]

Issue #, if available:

Description of changes:

• Make partial/missing creds a transient error in the profile credentials provider instead of creation failure to keep it consistent with the previous behavior.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (534b445) 79.59% compared to head (7dcef33) 79.69%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #226 +/- ## ========================================== + Coverage 79.59% 79.69% +0.10% ========================================== Files 33 33 Lines 5836 5832 -4 ========================================== + Hits 4645 4648 +3 + Misses 1191 1184 -7 ```

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