Fix app layer CRDs
Fix app layer CRDs

* rename Apps to App
* filter ChartAssignments propagation by robot
* don't sync App and AppRollout to robots
* remove required fields since we do validation in webhooks and they are
  getting in the way at times

Signed-off-by: Fabian Reinartz <bb86cc68560718128c801bf7438361ace07bbc0d@google.com>
Change-Id: I89e2f0c815c775cc5a0fb72f13eea0c927f67f42
GitOrigin-RevId: 1d3dfc835504c9ec80f55dfcf5cb25b73f259275

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core