Merge changes from topics "runtime-apex-otapreopt_chroot-tear-down", "runtime-apex-installd-support", "runtime-apex-otapreopt_chroot-support"

* changes:
  Implement a tear-down phase in otapreopt_chroot.
  Revert^2 "Have installd use ART binaries from the Android Runtime APEX."
  Revert^2 "Have `otapreopt_chroot` mount APEX packages in the chroot dir."