Deprecate `--sdk-auth` of `az ad sp create-for-rbac`

**Related command**

```
az ad sp create-for-rbac
```

**Is your feature request related to a problem? Please describe.**

The original designed consumers of the `az ad sp create-for-rbac --sdk-auth` JSON output - Azure SDKs (Java, Python, etc.) have deprecated the usage of `get_client_from_json_dict` (https://github.com/Azure/azure-sdk-for-python/issues/15075). Azure CLI should deprecate `--sdk-auth` as well.

However, we can't immediately take `--sdk-auth` away because GitHub Action heavily relies on `--sdk-auth`, even though GitHub Action is not a designed consumer of `--sdk-auth` (Azure/github#152).

The output of `az ad sp create-for-rbac` without or with `--sdk-auth` varies a lot.

Without `--sdk-auth`:

```
> az ad sp create-for-rbac

{
"appId": "21ec2946-231c-480f-86c7-824b215326a4",
"displayName": "azure-cli-2022-02-07-07-07-00",
"password": "{redacted_password}",
"tenant": "54826b22-38d6-4fb2-bad9-b7b93a3e9c5a"
}
```

With `--sdk-auth`:

```
> az ad sp create-for-rbac --sdk-auth
{
"clientId": "21ec2946-231c-480f-86c7-824b215326a4",
"clientSecret": "{redacted_password}",
"subscriptionId": "...",
"tenantId": "54826b22-38d6-4fb2-bad9-b7b93a3e9c5a",
"activeDirectoryEndpointUrl": "https://login.microsoftonline.com",
"resourceManagerEndpointUrl": "https://management.azure.com/",
"activeDirectoryGraphResourceId": "https://graph.windows.net/",
"sqlManagementEndpointUrl": "https://management.core.windows.net:8443/",
"galleryEndpointUrl": "https://gallery.azure.com/",
"managementEndpointUrl": "https://management.core.windows.net/"
}
```

The root cause leading to this confusion is due to the **name inconsistency** between Azure AD and Azure SDKs (https://github.com/Azure/azure-cli/pull/19872#issuecomment-1031153690):

| Azure AD names | Azure SDK names |
| ------------------ | --------------- |
| `appId` | `clientId` |
| `password` | `clientSecret` |
| `tenant`/directory | `tenantId` |

**Describe the solution you'd like**

We should either

- Work with GitHub Action team to deprecate `--sdk-auth`
- Keep `--sdk-auth` indefinitely

**Additional context**

- https://github.com/Azure/azure-cli/pull/19414
- https://github.com/Azure/azure-cli/pull/19872
- https://github.com/Azure/azure-cli/pull/19853