Show branch like comparison summary on environments list

Problem

The existing environments view already delivers on a way to know what is in a certain environment. However, it does not provide an easy way to show a comparison.

Proposal

Compare all environments refs against a solid default => the default branch. Then show a summary of that comparison by default in the environments list view

This way it will be easy to gauge how far ahead/behind a certain environment will be VS the default branch.

Design

• Add comparison column in environments view
• Compare by default with the "default branch"