Add test to Validate if duplicate metrics are intentional #26687
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Description:
This test alerts a user if a metric is duplicated across receivers, and instructs the user to add said metric to an allow list if this is intentional.
If semantic conventions on the duplicate metric exist, validating is a matter of ensuring they both fulfill semantic intent. For validating duplicate metrics for which there is no semantic conventions, additional discussion is needed with the semantic conventions WG as mentioned in the issue. For the time being, it will be best judgment.
Link to tracking Issue: #26499