[apicenter] Update apicenter projects to use snippets (#32473)

### Packages impacted by this PR

- @azure/arm-apicenter

### Issues associated with this PR

- #32416

### Describe the problem that is addressed by this PR

Updates all projects under `apicenter` to use snippets extraction.

### 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?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

sdk/apicenter/arm-apicenter/README.md

@@ -48,20 +48,28 @@ Set the values of the client ID, tenant ID, and client secret of the AAD applica
 
 For more information about how to create an Azure AD Application check out [this guide](https://learn.microsoft.com/azure/active-directory/develop/howto-create-service-principal-portal).
 
-```javascript
-const { AzureAPICenter } = require("@azure/arm-apicenter");
-const { DefaultAzureCredential } = require("@azure/identity");
-// For client-side applications running in the browser, use InteractiveBrowserCredential instead of DefaultAzureCredential. See https://aka.ms/azsdk/js/identity/examples for more details.
+Using Node.js and Node-like environments, you can use the `DefaultAzureCredential` class to authenticate the client.
+
+```ts snippet:ReadmeSampleCreateClient_Node
+import { AzureAPICenter } from "@azure/arm-apicenter";
+import { DefaultAzureCredential } from "@azure/identity";
 
 const subscriptionId = "00000000-0000-0000-0000-000000000000";
 const client = new AzureAPICenter(new DefaultAzureCredential(), subscriptionId);
+```
+
+For browser environments, use the `InteractiveBrowserCredential` from the `@azure/identity` package to authenticate.
 
-// For client-side applications running in the browser, use this code instead:
-// const credential = new InteractiveBrowserCredential({
-//   tenantId: "<YOUR_TENANT_ID>",
-//   clientId: "<YOUR_CLIENT_ID>"
-// });
-// const client = new AzureAPICenter(credential, subscriptionId);
+```ts snippet:ReadmeSampleCreateClient_Browser
+import { InteractiveBrowserCredential } from "@azure/identity";
+import { AzureAPICenter } from "@azure/arm-apicenter";
+
+const subscriptionId = "00000000-0000-0000-0000-000000000000";
+const credential = new InteractiveBrowserCredential({
+  tenantId: "<YOUR_TENANT_ID>",
+  clientId: "<YOUR_CLIENT_ID>",
+});
+const client = new AzureAPICenter(credential, subscriptionId);
 ```
 
 ### JavaScript Bundle
@@ -80,8 +88,9 @@ To use this client library in the browser, first you need to use a bundler. For
 
 Enabling logging may help uncover useful information about failures. In order to see a log of HTTP requests and responses, set the `AZURE_LOG_LEVEL` environment variable to `info`. Alternatively, logging can be enabled at runtime by calling `setLogLevel` in the `@azure/logger`:
 
-```javascript
-const { setLogLevel } = require("@azure/logger");
+```ts snippet:SetLogLevel
+import { setLogLevel } from "@azure/logger";
+
 setLogLevel("info");
 ```
 

sdk/apicenter/arm-apicenter/package.json

@@ -75,7 +75,7 @@
     "unit-test": "npm run unit-test:node && npm run unit-test:browser",
     "unit-test:browser": "echo skipped",
     "unit-test:node": "dev-tool run test:vitest",
-    "update-snippets": "echo skipped"
+    "update-snippets": "dev-tool run update-snippets"
   },
   "sideEffects": false,
   "//metadata": {

sdk/apicenter/arm-apicenter/test/snippets.spec.ts

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+import { describe, it } from "vitest";
+import { setLogLevel } from "@azure/logger";
+import { DefaultAzureCredential, InteractiveBrowserCredential } from "@azure/identity";
+import { AzureAPICenter } from "@azure/arm-apicenter";
+
+describe("snippets", () => {
+  it("ReadmeSampleCreateClient_Node", async () => {
+    const subscriptionId = "00000000-0000-0000-0000-000000000000";
+    const client = new AzureAPICenter(new DefaultAzureCredential(), subscriptionId);
+  });
+
+  it("ReadmeSampleCreateClient_Browser", async () => {
+    const subscriptionId = "00000000-0000-0000-0000-000000000000";
+    const credential = new InteractiveBrowserCredential({
+      tenantId: "<YOUR_TENANT_ID>",
+      clientId: "<YOUR_CLIENT_ID>",
+    });
+    const client = new AzureAPICenter(credential, subscriptionId);
+  });
+
+  it("SetLogLevel", async () => {
+    setLogLevel("info");
+  });
+});