[8.15](backport #2347) Fix Azure ARM Template: missing resources

[mergify]

Summary of your changes

By setting resourceGroup to role assignment, the role assignment has a specific (reduced) scope for the specified resource group.

Role assignment with resourceGroup (scope to this specific resource group):

{
    "properties": {
        "roleDefinitionId": "/subscriptions/<sub id>/providers/Microsoft.Authorization/roleDefinitions/<definition id>",
        "principalId": "<pid>",
        "principalType": "ServicePrincipal",
        "scope": "/subscriptions/<sub id>/resourcegroups/evgb-815bclong"
    },
    "id": "/subscriptions/<sub id>/resourcegroups/evgb-815bclong/providers/Microsoft.Authorization/roleAssignments/<id>",
    "type": "Microsoft.Authorization/roleAssignments",
    "name": "<id>"
}

Role assignment without resourceGroup (scope to the subscription):

{
    "properties": {
        "roleDefinitionId": "/subscriptions/<sub id>/providers/Microsoft.Authorization/roleDefinitions/<definition id>",
        "principalId": "<pid>",
        "principalType": "ServicePrincipal",
        "scope": "/subscriptions/<sub id>"
    },
    "id": "/subscriptions/<sub id>/providers/Microsoft.Authorization/roleAssignments/<id>",
    "type": "Microsoft.Authorization/roleAssignments",
    "name": "<id>"
}

Screenshot/Data

Related Issues

Fixes: #2346

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary README/documentation (if appropriate)

Introducing a new rule?

• Generate rule metadata using this script
• Add relevant unit tests
• Generate relevant rule templates using this script, and open a PR in elastic/packages/cloud_security_posture

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This is an automatic backport of pull request #2347 done by [Mergify](https://mergify.com).

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