Delete environs and stages

WARNNING: Make sure you have plans to handle hosts and services after environs and stages being deleted. Once they are deleted, the services and hosts will not be managed by Teletraan anymore.

Environs and stages can only be deleted when they have no capacity defined.

In the Environement page, a button is created to mark a build as bad build. Click the button. The build can be marked as Bad.

After submit, this build and all the subsequent builds on the same build name and branch will be treated as bad builds until one build has been tagged as good.

For all bad builds, there is a banner saying the build is bad and the Mark Build As Good button will be available. Once the issue has been fixed. Engineers can set the build containing the fixed commits to be good.