Create a milestone planning issue template
Problem
Most product managers seem to use planning issues for monthly milestone planning, but everyone seems to have developed their own approach to the issue.
Additionally, we have a number of product principles that we'll catch after the fact with issues like Product Review: enabled by default or the automatic monthly MVC/config/pricing issue. Ideally, we catch these issues before they enter development so we can course correct.
We can the planning process easier and more consistent for PMs if we develop a template for folks to use.
Proposal
Introduce a planning issue template in the Product project (https://gitlab.com/gitlab-com/Product/-/issues/) that PMs can use. The template should have a checklist of planning steps and product principles we should check to make sure we're adhering to (e.g. defaulting features to on, seeking feedback from other PMs on MVCs, making sure that paid capabilities have pricing tiers specified, etc).