Release Request: azure-resourcemanager-authorization 2.54.0-beta.1 (Deny Assignment GA)

### Service / Package

- **Service:** Authorization
- **Package:** `azure-resourcemanager-authorization`
- **Requested version:** `2.54.0-beta.1`
- **Group ID:** `com.azure.resourcemanager`

### Request

Requesting a beta release of `azure-resourcemanager-authorization` `2.54.0-beta.1` to Maven Central.

The SDK code and `CHANGELOG.md` entry for `2.54.0-beta.1` were merged on **2026-04-17** via [PR #48751](https://github.com/Azure/azure-sdk-for-java/pull/48751) (TypeSpec-generated update). The package was also migrated from `sdk/resourcemanager/` to `sdk/authorization/` in [PR #48721](https://github.com/Azure/azure-sdk-for-java/pull/48721) on 2026-04-08.

The merge added support for new **Deny Assignment** management plane operations:
- `DenyAssignmentsClient.createOrUpdate(...)`
- `DenyAssignmentsClient.delete(...)`

These are the public client surface for the Deny Assignment GA feature in the Azure Authorization 2024-09-01-preview API.

### Why publish now

This is currently the only Maven-Central-side blocker for downstream Java validation of the Deny Assignment feature. The CHANGELOG is updated and the SDK code is merged, but the artifact has not yet been pushed to `repo1.maven.org`.

For context: the latest published artifact is `2.53.8` (2026-03-31), and the last beta on Maven Central is `2.29.0-beta.1` from 2023-07-19.

### Pull Requests

- Code merge: https://github.com/Azure/azure-sdk-for-java/pull/48751 (merged 2026-04-17)
- Path migration: https://github.com/Azure/azure-sdk-for-java/pull/48721 (merged 2026-04-08)

### Verification

```text
$ curl -I https://repo1.maven.org/maven2/com/azure/resourcemanager/azure-resourcemanager-authorization/2.54.0-beta.1/azure-resourcemanager-authorization-2.54.0-beta.1.pom
HTTP/1.1 404 Not Found
```

### Downstream impact

Java SDK is one of the test surfaces for the Deny Assignment GA test plan. Until `2.54.0-beta.1` is on Maven Central we cannot run a Java smoke harness against the new APIs. PowerShell smoke is already passing against the merged TypeSpec; we'd like to validate Java parity as soon as the artifact ships.

Thanks!