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Fixes issue in #2802
Custom endpoints will still flow through endpoint resolution, but for S3, it also returns Sigv4 signing. That endpoint is merged with service defaults (also Sigv4) and then eventually signed by the generic signer. Legacy sigv2 signing, when enabled, would sign on top of generic signing, which overrode Authorization. This worked for S3 but not for 3rd party solutions coincidentally because of Date Time parsing. This change fixes the behavior so that they are mutually exclusive.