Add a spec for the `handleClusterError` helper

Anton Kalmykovrequested to merge
gitlab-community/gitlab-org/gitlab:461156_Write_a_test_for_the_handleClusterError_helper into master
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What does this MR do and why?

Add a spec for the handleClusterError helper

Closes: #461156

Changelog: added

Edited by 🤖 GitLab Bot 🤖

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