monitor package-2021-09 has two different AzureResource

The monitor service package-2021-09 has two different definitions of AzureResource. It shouldn't included two different definitions in the same package. Both are referenced. I had to exclude this package from the Azure SDK for Rust. https://github.com/Azure/azure-sdk-for-rust/pull/580

• Microsoft.Insights/stable/2021-09-01/actionGroups_API.json
  https://github.com/Azure/azure-rest-api-specs/blob/main/specification/monitor/resource-manager/Microsoft.Insights/stable/2021-09-01/actionGroups_API.json#L421-L470

• Microsoft.Insights/stable/2020-10-01/activityLogAlerts_API.json
  https://github.com/Azure/azure-rest-api-specs/blob/main/specification/monitor/resource-manager/Microsoft.Insights/stable/2020-10-01/activityLogAlerts_API.json#L297-L334

``` yaml $(tag) == 'package-2021-09'
input-file:
- Microsoft.Insights/stable/2015-04-01/autoscale_API.json
- Microsoft.Insights/stable/2015-04-01/operations_API.json
- Microsoft.Insights/stable/2016-03-01/alertRulesIncidents_API.json
- Microsoft.Insights/stable/2016-03-01/alertRules_API.json
- Microsoft.Insights/stable/2016-03-01/logProfiles_API.json
- Microsoft.Insights/preview/2017-05-01-preview/diagnosticsSettings_API.json
- Microsoft.Insights/preview/2017-05-01-preview/diagnosticsSettingsCategories_API.json
- Microsoft.Insights/stable/2021-09-01/actionGroups_API.json
- Microsoft.Insights/stable/2015-04-01/activityLogs_API.json
- Microsoft.Insights/stable/2015-04-01/eventCategories_API.json
- Microsoft.Insights/stable/2015-04-01/tenantActivityLogs_API.json
- Microsoft.Insights/stable/2018-01-01/metricDefinitions_API.json
- Microsoft.Insights/stable/2018-01-01/metrics_API.json
- Microsoft.Insights/stable/2019-03-01/metricBaselines_API.json
- Microsoft.Insights/stable/2018-03-01/metricAlert_API.json
- Microsoft.Insights/stable/2018-04-16/scheduledQueryRule_API.json
- Microsoft.Insights/preview/2017-12-01-preview/metricNamespaces_API.json
- Microsoft.Insights/preview/2018-11-27-preview/vmInsightsOnboarding_API.json
- Microsoft.Insights/preview/2019-10-17-preview/privateLinkScopes_API.json
- Microsoft.Insights/stable/2020-10-01/activityLogAlerts_API.json
- Microsoft.Insights/stable/2021-04-01/dataCollectionEndpoints_API.json
- Microsoft.Insights/stable/2021-04-01/dataCollectionRuleAssociations_API.json
- Microsoft.Insights/stable/2021-04-01/dataCollectionRules_API.json
```.

Start by comparing the AzureResource definitions in Microsoft.Insights/stable/2021-09-01/actionGroups_API.json and Microsoft.Insights/stable/2020-10-01/activityLogAlerts_API.json, then inspect the package-2021-09 input list in the issue. Done means the package contains one consistent AzureResource definition while both referenced operations remain valid; validate the generated package or relevant specification checks.