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

### 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`
issue