[Microsoft.OperationalInsights/workspaces]: Warning BCP187 on system assigned identity

### Resource Type

Microsoft.OperationalInsights/workspaces

### Api Version

2020-08-01

### Issue Type

Other

### Other Notes

Creating a logAnalyticsWorkspace in bicep with a system assigned identity issues a Warning BCP187, while specified in documentation @ https://learn.microsoft.com/en-us/azure/templates/microsoft.operationalinsights/workspaces?pivots=deployment-language-bicep

### Bicep Repro

``` bicep
resource logAnalyticsWorkspace 'Microsoft.OperationalInsights/workspaces@2020-08-01' = {
name: 'MyLogAnalyticsWorkspace'
location: resourceGroupLocation
identity: {
type: 'SystemAssigned'
}
properties: {
sku: {
name: 'pergb2018'
}
}
}
```

### Confirm

- [X] I have read the troubleshooting guide and looked for duplicates.

Start with the provided Bicep repro for Microsoft.OperationalInsights/workspaces@2020-08-01 and compare it with the linked Azure template documentation. Reproduce the BCP187 warning for the system-assigned identity; done means the documented identity configuration no longer produces that warning.

Written by the indexing model from the issue text.