Merge changes Ia4dcc893,Id33b11ce,Id56307db,Ie4e28985,I9e6ebf9d into main

* changes:
  Helper script for running TransactionFlinger CUJs
  Add moving layer CUJ for caching
  Add workload that draws a blur region over an animating background
  Add workload that toggles blur behind
  Add common infrastructure for defining a Scene