Unify aws_conn_id type to always be str | None #37768
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All the
AwsHooks support passingNoneforaws_conn_idmeaning that is should use the default boto3 behavior for deriving credentials. But in lots of operators theaws_conn_idtype is typed as onlystrthis leads to type errors in users code if they pass None toaws_conn_ideven though this is supported in practice.This PR resolves this by updating the all (maybe just most) type annotations for
aws_conn_idto bestr | Noneinstead of juststr.^ Add meaningful description above
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