Improve `Feature Flag Roll Out` issue template
Currently we have a pretty generic Feature Flag Roll Out issue template.
This issue is to discuss how we want to refactor this template:
- to provide more comprehensive and realistic feature flag lifecycle management plan
- treat feature flag removal as a schedulable as part of planning effort taken by team
- assign priority to issue and milestone to complete the rollout and removal
- annotate another parties involved in feature flag rollout
- have a trail of all changes related to feature flag rollout
Edited by Kamil Trzciński