[Bug]: Incorrect AWS S3 permissions causes opaque error

[codebutler]

What happened?

Preevy failed with "403: UnknownError" with no indication the problem was related to AWS/S3.

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Steps to reproduce the behavior

Use an AWS role that is missing required permissions.

Expected behavior

The error message should mention the problem happened when trying to access a preevy profile on S3, and should specifically say which S3 API failed.

In my case the role did have access to s3.GetObject, but was missing s3.HeadBucket.

What OS are you seeing the problem on?

Linux

Additional context

No response

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