chore: Remove old task_helpers related to ACM operator install (terraform-google-modules#1319)

* Update version to 21.2 to fix the exception of node pool of terraform example * Update the gke module version to latest in the examples * Update the terraform provider version for google-beta * Remove old task_helpers related to ACM operator install Co-authored-by: Bharath KKB <bharathkrishnakb@gmail.com>

Author: Abhisek Purwar

build/int.cloudbuild.yaml

@@ -14,9 +14,6 @@
 
 timeout: 12600s
 steps:
-- id: download acm
- name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
- args: ['/bin/bash', '-c', 'source /usr/local/bin/task_helper_functions.sh && download_acm']
 - id: prepare
  name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
  args: ['/bin/bash', '-c', 'source /usr/local/bin/task_helper_functions.sh && prepare_environment && chmod 600 /builder/home/.netrc && sleep 120']