Child Resources Parse Bug

Heyo 👋

I noticed a bug when trying to parse templates introducing resources with child resources.

Example template:
```json
"resources": [
{
"type": "Microsoft.Sql/servers",
"name": "[variables('sqlserverName')]",
...
},
"resources": [
{
"type": "databases",
"name": "[variables('databaseName')]",
...
},
{
"type": "Microsoft.Sql/servers/administrators",
"name": "[concat(variables('sqlserverName'), '/', 'activeDirectory')]",
# ...
},
]
```

The code below contains the bug. Trying to access the wrong key for the parent flattened resource:
```csharp
private Dictionary flattenedResources = new Dictionary(StringComparer.OrdinalIgnoreCase);
...
Later in SaveFlattenedResources
...
if (parentName != null && parentType != null)
{
resource.Path = $"{flattenedResources[$"{parentName} {parentType}"].resource.Path}.resources[{i}]"; // <-- Fails when querying the Dict because the key is wrong.

dictionaryKey = $"{parentName}/{resource.Name.Value} {parentType}/{resource.Type.Value}";
}
else
{
if (resource.Path == "")
{
resource.Path = $"resources[{i}]";
}

dictionaryKey = $"{resource.Name.Value} {resource.Type.Value} {resource.LineNumber}"; // <-- Faulty line. Appending `resource.LineNumber` to the key
}

var resourceExpandedPath = $"{(parentExpandedPath != "" ? parentExpandedPath + "." : "")}resources[{i}]";
flattenedResources.Add(dictionaryKey, (resource, resourceExpandedPath));

if (resource.Resources != null)
{
string resourceNamePrefix = parentName == null ? "" : $"{parentName}/";
string resourceTypePrefix = parentType == null ? "" : $"{parentType}/";

SaveFlattenedResources(resource.Resources, $"{resourceNamePrefix}{resource.Name.Value}", $"{resourceTypePrefix}{resource.Type.Value}", resourceExpandedPath);
}
```

[Easy fix, just change the line](https://github.com/Azure/arm-template-parser/blob/17414c6e4998314b70a698024800d4a43daf71e1/Template.Parser.Core/ArmTemplateProcessor.cs#L296)
`dictionaryKey = $"{resource.Name.Value} {resource.Type.Value} {resource.LineNumber}";`
|
\\/
`dictionaryKey = $"{resource.Name.Value} {resource.Type.Value}";`

Unless you guys know that this is there for a reason and then I don't know how to add the correct `resource.LineNumber` to the key when accessing the dictionary.

Thanks in advance!