[Identity] Prepare 1.18.0-beta.1 release for Azure.Identity (#53948)

* Ran the prepare release script

* Update sdk/identity/Azure.Identity/CHANGELOG.md

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: JonathanCrd

sdk/identity/Azure.Identity/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 1.18.0-beta.1 (Unreleased)
+## 1.18.0-beta.1 (2025-11-14)
 
 ### Features Added
 
-- Added Kubernetes token proxy support (identity binding mode) to `WorkloadIdentityCredential`. When enabled via the `IsAzureKubernetesTokenProxyEnabled ` option, the credential redirects token requests to an AKS-provided proxy to work around Entra ID's limit on federated identity credentials per managed identity. This feature is opt-in and only available when using `WorkloadIdentityCredential` directly (not supported by `DefaultAzureCredential` or `ManagedIdentityCredential`).
-
-### Breaking Changes
-
-### Bugs Fixed
+- Added Kubernetes token proxy support (identity binding mode) to `WorkloadIdentityCredential`. When enabled via the `IsAzureKubernetesTokenProxyEnabled` option, the credential redirects token requests to an AKS-provided proxy to support scenarios exceeding the [20 federated identity credential limit](https://learn.microsoft.com/entra/identity/managed-identities-azure-resources/overview#use-managed-identity-as-a-federated-identity-credential-fic-on-an-entra-id-app) per Entra ID application. This feature is opt-in and only available when using `WorkloadIdentityCredential` directly (not supported by `DefaultAzureCredential` or `ManagedIdentityCredential`).
 
 ### Other Changes