Revert changes from MR !40665
Reverts changes related to !40665 (merged) and #6511 (closed), we will be revisiting the docker approach instead.
See details in this comment: !40665 (comment 287868133)
Tasks
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Remove related environment variables CI_PRE_CLONE_SCRIPT_TESTandCI_REPO_CACHE_CREDENTIALS
Edited by Chad Woolley