Clean up deprecated Network Security Group analytics solution

# Rule request

## Suggested rule change

Network Security Group analytics solution within Log Analytics is deprecated. This solution can be cleaned up.

Use Traffic Analytics instead.

## Applies to the following

The rule applies to the following:

- Resource type: **Microsoft.OperationsManagement/solutions**
- Product: _OMSGallery/AzureNSGAnalytics_

## Additional context

[Deprecation of Network Security Group analytics solution](https://docs.microsoft.com/en-us/azure/azure-monitor/insights/azure-networking-analytics#azure-network-security-group-analytics-solution-in-azure-monitor)
[Azure template reference](https://docs.microsoft.com/en-us/azure/templates/microsoft.operationsmanagement/2015-11-01-preview/solutions)