codegen: Remove protocol test skipping for supported features.

[jasdel]

Updates the SDK's code generation of protocol test to no longer skip
tests for features that are supported by the SDK.

Regenerates SDK API clients for aws/smithy-go#360 and previously skipped protocol tests

[jasdel]

Created #1631 tracking endpoint prefix and host label protocol tests the SDK is skipping

[jasdel]

Unit test failing because presigned URL behavior needs to deviate from regular API behavior and no include or remove the auto set content-type for operations with streaming input.

[skmcgrail]

This change in behavior I believe is unexpected.

--- FAIL: TestPutObject_PresignURL (0.05s)
    --- FAIL: TestPutObject_PresignURL/nil_body_with_content-length (0.00s)
        presign_test.go:277: expected signed header to be map[Content-Length:[100] Host:[mock-bucket.s3.us-west-2.amazonaws.com]], got map[Content-Length:[100] Content-Type:[application/octet-stream] Host:[mock-bucket.s3.us-west-2.amazonaws.com]], 
             diff :   http.Header{
              	"Content-Length": {"100"},
            + 	"Content-Type":   {"application/octet-stream"},
              	"Host":           {"mock-bucket.s3.us-west-2.amazonaws.com"},
              }