[Identity] Remove samples (Azure#37242)

### Packages impacted by this PR
@azure/identity

### Issues associated with this PR


### Describe the problem that is addressed by this PR
- Simplify samples folder by removing other samples and keeping the main
`DefaultAzureCredential` sample

### 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)

---------

Co-authored-by: Scott Addie <10702007+scottaddie@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

sdk/identity/identity/samples-dev/azureDeveloperCliCredential.ts

@@ -12,25 +12,15 @@ import { KeyClient } from "@azure/keyvault-keys";
 import "dotenv/config";
 
 /**
- * The `DefaultAzureCredential` is appropriate for most scenarios where the application is intended to ultimately be run in the Azure Cloud.
+ * `DefaultAzureCredential` is appropriate for most scenarios where the application is intended to ultimately be run in the Azure Cloud.
  * This is because the `DefaultAzureCredential` combines credentials commonly used to authenticate when deployed,
  * with credentials used to authenticate in a development environment.
  *
- * For more information, you may go to our readme: [link](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/identity/identity#defaultazurecredential)
+ * For more information, see [DefaultAzureCredential overview](https://aka.ms/azsdk/js/identity/credential-chains#defaultazurecredential-overview).
  */
 
 export async function main(): Promise<void> {
-  // AZURE_TOKEN_CREDENTIALS can be set to `EnvironmentCredential` in the .env file in this example.
-  // You can specify the list of required environment variables like this:
-  const credential = new DefaultAzureCredential({
-    requiredEnvVars: [
-      "AZURE_CLIENT_ID",
-      "AZURE_TENANT_ID",
-      "AZURE_CLIENT_SECRET",
-      "AZURE_TOKEN_CREDENTIALS",
-    ],
-  });
-
+  const credential = new DefaultAzureCredential();
   const keyVaultUrl = `https://key-vault-name.vault.azure.net`;
   const client = new KeyClient(keyVaultUrl, credential);
 

sdk/identity/identity/samples-dev/azurePipelinesCredential/azurePipelinesCredential.ts

@@ -2,7 +2,7 @@
 // Licensed under the MIT License.
 
 /**
- * @summary demonstrates how to get a bearer token.
+ * @summary demonstrates how to get a bearer token and manually add it to a request.
  */
 
 import { PipelineRequest, createPipelineRequest } from "@azure/core-rest-pipeline";