Clear memoization of a stubbed object
What does this MR do?
This fixes succeeding specs that call pipeline_creation_step_histogram
by preventing the memoization of an RSpec stub into the class instance variable.
Related to #339979 (closed)
How to setup and validate locally (strongly suggested)
bin/rspec spec/lib/gitlab/ci/pipeline/metrics_spec.rb spec/lib/gitlab/ci/templates/Terraform/base_latest_gitlab_ci_yaml_spec.rb
Edited by Heinrich Lee Yu