Remove duplicate metrics for group "product planning"
Problem
The following metrics are duplicates of each other:
usage_activity_by_stage_monthly.create.action_monthly_active_users_design_management
redis_hll_counters.source_code.design_action_monthly
This leads to superfluous code and can lead to confusion around the SSOT for this metric
Proposed Solution
We remove design_action_monthly
in favor of action_monthly_active_users_design_management
since the redis_hll_counters
based on feedback from #391730 (comment 1292088322)
Edited by Sebastian Rehm