Give warning if it looks like the $schema is incorrect for the resources being used

[StephenWeatherford]

... For example, if trying to use a resourceGroup resource inside a deploymentParameters.json# deployment.

[StephenWeatherford]

Here's another example:

{
    "$schema": "https://schema.management.azure.com/schemas/2018-05-01/subscriptionDeploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "resources": [
      {
        "name": "name",
        "type": "Microsoft.Subscription/aliases",
        "apiVersion": "2020-09-01",
        "properties": {
          "workLoad": "workLoad",
          "displayName": "displayName",
          "billingScope": "billingScope",
          "managementGroupId": "[tenantResourceId('Microsoft.Management/managementGroups/', parameters('targetManagementGroupId'))]"
        }
      }
    ]
  }

[StephenWeatherford]

... and this error (from #1060):

Template validation failed: The template resource 'mgname-test' at line '14' and column '5' is not valid: The language expression property 'location' doesn't exist, available properties are 'name, properties'.. Please see https://aka.ms/arm-template-expressions for usage details.