Improve the evaluation of copied resources

Because the tool can now explore child resources to match a resource type, we could sometimes output repeated results. For example, when evaluating rule TA-000021 on this resource: https://github.com/Azure/template-analyzer/blob/18f2f5dca00cb7791097a96c1b1fc4a27571bd3d/src/Analyzer.Core.BuiltInRuleTests/Tests/TA-000021/AutomationAccountsVariables.json#L39

Original template with the mentioned resource:

Expanded one:

For some rules, we need to consider those copied resources during the evaluation, and for others, it results in repeated results

In PR #250 we started filtering repeated results from the tool output as a temporal solution to this problem, as we assume an elegant and performant solution to this could result in a big change in how the tool evaluates rules

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