port 49776-pipeline-job-log-page-uses-too-much-cpu-for-loading-animation to EE
requested to merge ee-49776-pipeline-job-log-page-uses-too-much-cpu-for-loading-animation into master
What does this MR do?
Port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20915 to EE.
What are the relevant issue numbers?
Closes #49776