Support presubmit_properties and postsubmit_properties in .ci.yaml targets #122561
Description
The postsubmit_properties entry is supported in the ci.yaml, and also mentioned in the CI_YAM.md doc. However, real supporting backend logic is missing. This has caused confusion.
The logic should be supported in both Cocoon scheduling and the infra ci yaml roller logic.
At the same time, we can support presubmit_properties as well. (see context below).
Context: flutter/engine#40260