MK8S-184 - Add a mock for Salt cp.get_file_str #4823

Job	Run time
build-devcontainer / build-and-publish-devcontainer	21s
changed-files	11s
unit_tests_crd_client_generator	-1s
unit_tests_ui	-1s
build_integration_container_nginx	-1s
build-shell-ui	-1s
unit_tests_shell_ui	-1s
integration_tests_ui	0s
unit_tests_salt	1m 57s
lint	3m 50s
build / build-shell-ui / shell-ui	1m 11s
build / build-devcontainer / build-and-publish-devcontainer	27s
unit_tests_lib_alert_tree	0s
build-docs	0s
unit_tests_metalk8s_operator	0s
unit_tests_storage_operator	0s
build / build	23m 41s
build / build-docs / build-devcontainer / build-and-publish-devcontainer	20s
build / build-docs / docs	2m 10s
build / write-final-status	10s
e2e-tests / multi-node-e2e / multi-node	1h 22m 32s
e2e-tests / single-node-e2e / single-node	1h 20m 15s
e2e-tests / single-node-e2e / destroy-single-node-cluster	7m 16s
e2e-tests / multi-node-e2e / destroy-multi-node-cluster	7m 19s
write-final-status	20s
	3h 31m 55s

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