[Bug] ArmResourceListByParent does not respect operation name but hard code to ListByResourceGroup.

[allenjzhang]

Describe the bug
When using ArmResourceListByParent template, operation id is hard coded to _ListByResourceGroup

Expected behavior
listTest should be correctly set in operation_id.

[markcowl]

There are actually template parameters that set this

[markcowl]

I think deferring to 'name' makes sense for parallelism, but we should then have a linting rule that promotes the listBy naming, because these list operations can be combined in client generation.

[markcowl]

You can do this with a projectedName decorator - this is necessary because we are using a decorator to enforce a particular naming pattern, here is a sample playground

[markcowl]

The decorator here is a legacy from when only interface templates were avaiable, and not operation templates. We should likely update the existing interface templates to use this decorator, update any existing specs to specify the correct name in their usage of the operation templates, and remove the decorator from the operation templates altogether.

We may want to also add a linting rule to suggest correct naming patterns.