fix: update unit tests to conform to error (#264)

Author: kneekey23

codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/ec2query/Ec2QueryHttpResponseBindingErrorGeneratorTests.kt

@@ -16,7 +16,7 @@ class Ec2QueryHttpResponseBindingErrorGeneratorTests {
         contents.shouldSyntacticSanityCheck()
         val expectedContents =
             """
-            public enum GreetingWithErrorsOutputError: Equatable {
+            public enum GreetingWithErrorsOutputError: Swift.Error, Equatable {
                 case complexError(ComplexError)
                 case invalidGreeting(InvalidGreeting)
                 case unknown(UnknownAWSHttpServiceError)

codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/restxml/AWSRestXMLHttpResponseBindingErrorGeneratorTests.kt

@@ -17,7 +17,7 @@ class AWSRestXMLHttpResponseBindingErrorGeneratorTests {
         contents.shouldSyntacticSanityCheck()
         val expectedContents =
             """
-            public enum GreetingWithErrorsOutputError: Equatable {
+            public enum GreetingWithErrorsOutputError: Swift.Error, Equatable {
                 case complexXMLError(ComplexXMLError)
                 case invalidGreeting(InvalidGreeting)
                 case unknown(UnknownAWSHttpServiceError)