remove only_latest_easystacks.sh script, only relevant for CI workflows in `software-layer` repo #28

Job	Run time
eessi_container_script (help)	27s
eessi_container_script (listrepos_default)	1m 17s
eessi_container_script (listrepos_custom)	29s
eessi_container_script (run)	1m 19s
eessi_container_script (resume)	1m 20s
eessi_container_script (shell)	1m 18s
eessi_container_script (container)	1m 18s
	7m 28s

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