Testing: Update instructions for AGENT_PACKAGES_IN_GCS (#876)
Testing: Update instructions for AGENT_PACKAGES_IN_GCS (#876)

Co-authored-by: Jeff Erbrecht <367cd92d89c46a34127a18341bd84064ed989d8a@users.noreply.github.com>
GoogleCloudPlatform/ops-agent,GoogleCloudPlatform/ops-agent