Show stop environment button only for envs in certain tiers
### Problem > The "Stop environment" is highligted in this [environments] page, however, I do not think operators want to stop production and staging environments in general. Should we change the visibility of the button according to [the tier](https://docs.gitlab.com/ee/ci/environments/#deployment-tier-of-environments) e.g. only `testing` and `development` show the button. > > From #335417 ![image](/uploads/aec8d2be1f3217750950e2011d320110/image.png) ### Proposal Change visibility of the “stop environment” button to show only on certain tiers. Probably defined by configuration, and possible to override on `.gitlab-ci.yml`
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