cats: defer running readiness healthcheck test (#306)

cat 15.1.0 introduced the readiness healthcheck test[1] and is failing in the pipeline. This is because it needs capi, diego etc. from cf-d 32.2.0 but toolsmiths is a few versions behind and we checkout toolsmiths's env context[2] before our deploy.

I'm also not convinced that the buildpacks team needs to run these tests!

1. https://github.com/cloudfoundry/cf-acceptance-tests/releases/tag/v15.1.0
2. https://github.com/cloudfoundry/buildpacks-ci/blob/7b677a2baaffc1c2ae4b01504576f3ea9ffc2751/pipelines/cf-release/cf-release.yml#L207

tasks/cf-release/create-cats-integration-config/run

@@ -53,6 +53,7 @@ cat >cats-integration-config/integration-config.json <<-EOF
   "include_v3": false,
   "include_volume_services": false,
   "include_zipkin": false,
+  "readiness_health_checks_enabled": false,
   "stacks": ["cflinuxfs4"]
 }
 EOF