Improve Environment Page

Description

The environment page is unusable for us. We create a review site for each branch we have. But in this screen, you can no longer differentiate separate environments easily.

(Include problem, use cases, benefits, and/or goals)

Proposal

  1. Remove the prefix from the environment name
  2. Make the environment column wider, or allow it to be responsive
  3. Allow hiding columns like Deployment, Job, Commit
  4. Default sort to be Updated descending
  5. Possibly allow sorting by name or updated time
  6. Add search field for Environment

Links / references

See also: https://gitlab.com/gitlab-org/gitlab-ee/issues/3849

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