{AzureFrontdoor} fixes Azure/azure-cli#24758 fixing ActionType enum to include AnomalyScoring (#21947)

fixes Azure/azure-cli#24758 fixing ActionType enum to include AnomalyScoring

Running the below command to override the managed rules with --action set to AnomalyScoring fails:
> az network front-door waf-policy managed-rules override add

```
az network front-door waf-policy managed-rules override add: 'AnomalyScoring' is not a valid value for '--action'. Allowed values: Allow, Block, Log, Redirect.

```

This is because currently only the `Allow, Block, Log, Redirect` enums are specified. `AnomalyScoring` value should also be included in the `ActionType`  enums.

Author: navba-MSFT

specification/frontdoor/resource-manager/Microsoft.Network/stable/2022-05-01/webapplicationfirewall.json

@@ -918,7 +918,8 @@
         "Allow",
         "Block",
         "Log",
-        "Redirect"
+        "Redirect",
+        "AnomalyScoring"
       ],
       "x-ms-enum": {
         "name": "ActionType",