switch test-infra bazel canary to config=unit, create lint job
switch test-infra bazel canary to config=unit, create lint job

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid