Reconsider Deploy Boards match criteria

Right now, Deploy Boards uses the app label to match against CI_ENVIRONMENT_SLUG to determine which pods belong to what environment.

I think we should consider an alternate method, like:

• Matching the start of pod name to CI_ENVIRONMENT_SLUG.
• Matching the start of release label to CI_ENIVRONMENT_SLUG.

The reasons why:

1. The app label is not commonly configured, from what I can tell, in helm charts. It's typically set to the chart name.
2. The release name is quite frequently configured, and is as easy as helm install --name $CI_ENVIRONMENT_SLUG.
3. The pod names typically will start with the release name, but the benefit here is that this is what the Kubernetes auto-monitoring uses, as it is one of the few labels that is passed down to Docker. (And thus available to cAdvisor)

What I would propose is matching on either app or release, this way we can support additional deployments and it is likelier to "just work". And with the app matching, we are backwards compatible.