[core-client-rest] Update Serialization Check Logic (#30339)

### Describe the problem that is addressed by this PR
Currently, all request body that has content types that start with
"application/json" will be serialized by the `getRequestBody` function.
This is an issue for Schema Registry because the request body has
already been serialized and the content type also starts with
"application/json". Reordering the serialization method to check for
`Uint8Array` before checking for "application/json" would eliminate this
problem.

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?
- Add an option called `skipSerialization` in the internal options bag
for sending request. It'll affect the RLC experience and force the
customer to use this option to make a successful request
- Check for specific content types. It'll be limited in scope and affect
other services that also has a similar content type format

sdk/core/core-client-rest/CHANGELOG.md

@@ -1,15 +1,11 @@
 # Release History
 
-## 2.1.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 2.2.0 (2024-07-11)
 
 ### Other Changes
 
+- Update serialization to not serialize Uint8Array if the content type is "application/json". 
+
 ## 2.1.0 (2024-06-27)
 
 ### Features Added

sdk/core/core-client-rest/package.json

@@ -1,6 +1,6 @@
 {
  "name": "@azure-rest/core-client",
- "version": "2.1.1",
+ "version": "2.2.0",
  "description": "Core library for interfacing with Azure Rest Clients",
  "sdk-type": "client",
  "type": "module",

sdk/core/core-client-rest/src/sendRequest.ts

@@ -166,17 +166,15 @@ function getRequestBody(body?: unknown, contentType: string = ""): RequestBody {
  return { body };
  }
 
- const firstType = contentType.split(";")[0];
-
- if (firstType === "application/json") {
- return { body: JSON.stringify(body) };
- }
-
  if (ArrayBuffer.isView(body)) {
  return { body: body instanceof Uint8Array ? body : JSON.stringify(body) };
  }
 
+ const firstType = contentType.split(";")[0];
+
  switch (firstType) {
+ case "application/json":
+ return { body: JSON.stringify(body) };
  case "multipart/form-data":
  if (Array.isArray(body)) {
  return { multipartBody: buildMultipartBody(body as PartDescriptor[]) };