fix: sidebar codegen crashing and AWS Signature Auth flow (#4315)

Co-authored-by: jamesgeorge007 <25279263+jamesgeorge007@users.noreply.github.com>
Co-authored-by: Anwarul Islam <anwaarulislaam@gmail.com>

packages/hoppscotch-common/src/components/graphql/Authorization.vue

@@ -259,6 +259,10 @@ const selectAWSSignatureAuthType = () => {
     ...auth.value,
     authType: "aws-signature",
     addTo: "HEADERS",
+    accessKey: "",
+    secretKey: "",
+    region: "",
+    serviceName: "",
   } as HoppGQLAuth
 }