Update project HEAD from stream event

Handle `ProjectHeadUpdatedEvent` and update project's `HEAD` reference
on the replica.

Bug: Issue 40014694
Change-Id: Ib9a83442c390a493eb839d9edb115148d6f07438
3 files changed
tree: 2f3efedb64be8475fe3e3378ac8c078a6efda1d0
  1. example-setup/
  2. src/
  3. .gitignore
  4. BUILD
  5. Jenkinsfile
  6. LICENSE