Warn when an obsolete baseline is used within a run

[BernieWhite]

When a baseline is old there is currently no way to provide feedback to the user to switch to an alternative baseline.

Add the ability to display a warning when a out of date baseline is used within a run.

For example:

---
# Synopsis: This is an example baseline that is obsolete
kind: Baseline
metadata:
  name: ObsoleteBaseline
  annotations:
    obsolete: true
spec: { }