Remove unsued pipelines-related prometheus metric
What does this MR do?
This MR removes a legacy and unused pipelines-related prometheus metric, that we had added some time ago to investigate a problem with pipeline stages. It never logged anything, and should be either refactored or removed (this merge request removes it, we can introduce another metric in the future).
Does this MR meet the acceptance criteria?
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Has been reviewed by Backend
What are the relevant issue numbers?
Edited by Kamil Trzciński