fix: update prefix header tests to allow for empty headers #2415
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Background
What do these changes do?
Update protocol tests to catch an issue where SDKs were not serializing empty headers
Why are they important?
Had an issue where calling S3 with metadata with an empty value caused SDKs to not serialize the value and not send the header. While serialize empty strings and lists to headers in restXml and restJson1 #2403 addresses the general case of headers present but with no values, it wouldn't cover this scenario since S3 metadata headers are not modeled as httpHeader but as httpPrefixHeader
Testing
Generated tests on smithy-go and ran the new tests on aws-sdk-go-v2
Links
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