Regression: Pipelines v0.45 client breaks compatibility with older Pipeline servers

[wlynch]

Pipelines v0.45 removed support for embedded statuses, not only as a feature flag but from the API altogether. This means that newer Pipeline clients can no longer guarantee compatibility with older Pipeline servers (e.g. LTS versions), since the flag only defaulted to minimal as of v0.44.0 (and prior to that, used full instead of both).

We noticed this incompatibility in our e2e tests when we updated client versions: #712

In response, we either need to:

1. Drop support for Tekton Pipelines < v0.45 for new releases moving forward.
2. Require usage of embedded-status: minimal flag for older server versions.
3. See if we can rollback the change on the Pipelines side (we just need the field, not the controller functionality).
4. Fork our own Pipelines types for compatibility 🤢