Add env vars remapper, allowing the user to change multiple env vars … #13456

Job	Run time
towncrier_check	11s
check_if_release_branch	1s
changed_files	8s
build mirrord CLI	0s
check-rust-docs	1m 13s
test_agent_image	6m 27s
test_agent	3m 57s
lint	3m 13s
integration_tests	13m 40s
macos_tests	19m 50s
lint_markdown	0s
test_cli_image	6m 35s
e2e (docker)	15m 43s
e2e (containerd)	13m 37s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
ci	1s
	1h 24m 36s

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