[identity] fix workload identity bug (Azure#25119)

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

### Issues associated with this PR
Fixes Azure#25089

### Describe the problem that is addressed by this PR
The options bag may not be defined. Fixed the conditional logic to
reflect that otherwise it throws an error.

### 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
- [x] 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)_
- [x] Added a changelog (if necessary)

Author: KarishmaGhiya

sdk/identity/identity/CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ### Bugs Fixed
 
+- Fixed a bug in `WorkloadIdentity Credential`, to incorporate the case where the options can be `undefined` in a conditional check. Related issue [#25089](https://github.com/Azure/azure-sdk-for-js/issues/25089) with the fix [#25119](https://github.com/Azure/azure-sdk-for-js/pull/25119).
 ### Other Changes
 
 ## 3.2.0-beta.1 (2023-02-28)

sdk/identity/identity/src/credentials/workloadIdentityCredential.ts

@@ -62,9 +62,9 @@ export class WorkloadIdentityCredential implements TokenCredential {
     const workloadIdentityCredentialOptions = options as WorkloadIdentityCredentialOptions;
 
     if (
-      workloadIdentityCredentialOptions.clientId &&
-      workloadIdentityCredentialOptions.tenantId &&
-      workloadIdentityCredentialOptions.federatedTokenFilePath
+      workloadIdentityCredentialOptions?.clientId &&
+      workloadIdentityCredentialOptions?.tenantId &&
+      workloadIdentityCredentialOptions?.federatedTokenFilePath
     ) {
       const tenantId = workloadIdentityCredentialOptions.tenantId;
       if (tenantId) {