feat: add toggle to omit optional request body in Try It Out

[IsuruDilanga]

Summary

This PR does the following:

• Adds a RequestBodyWrapper component that wraps swagger-ui's
  RequestBody component via wrapComponents
• Shows a "Send request body" checkbox in Try It Out mode
  when requestBody.required is false or not set
• When unchecked, no body and no Content-Type header is sent
  in the actual HTTP request
• When checked (default), existing behavior is fully preserved

Closes #4807

Behavior

Scenario	Checkbox visible	Result
required: false + checkbox checked (default)	✅ Yes	Body sent normally — no change for existing users
required: false + checkbox unchecked	✅ Yes	No body, no Content-Type header sent
required: true	❌ No	Checkbox never appears — existing behavior unchanged

Files changed

• src/plugins/editor-preview-swagger-ui/components/RequestBodyWrapper.jsx ← new file
• src/plugins/editor-preview-swagger-ui/index.js ← registers RequestBody wrapComponent

How to test

Setup

Paste the following YAML into the editor:

openapi: 3.1.0
info:
  title: One game API
  version: "1.0"
servers:
  - url: http://127.0.0.1:8000
    description: Local development server
paths:
  /v2/auth:
    post:
      summary: Create an authorization token (optional body)
      operationId: createAuthV2
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                email:
                  type: string
        required: false
      responses:
        "200":
          description: Authorization token created
  /v2/auth/required:
    post:
      summary: Create an authorization token (required body)
      operationId: createAuthV2Required
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                email:
                  type: string
        required: true
      responses:
        "200":
          description: Authorization token created

---

Test 1 — Optional body, checkbox unchecked (main feature)

1. Click Try it out on POST /v2/auth
2. Confirm the "Send request body" checkbox appears ✅
3. Uncheck the checkbox → body textarea disappears
4. Click Execute
5. Open DevTools → Network tab → click the request
6. Go to Headers → confirm no Content-Type: application/json ✅
7. Confirm Request Payload section does not appear ✅

---

Test 2 — Optional body, checkbox checked (default behavior preserved)

1. Click Try it out on POST /v2/auth
2. Leave checkbox checked (default)
3. Click Execute
4. Open DevTools → Network tab → click the request
5. Confirm Content-Type: application/json header is present ✅
6. Confirm Request Payload section shows the JSON body ✅

---

Test 3 — Required body (no regression)

1. Click Try it out on POST /v2/auth/required
2. Confirm no checkbox appears — only the body textarea ✅
3. Existing behavior is completely unchanged ✅