It is customary to set a variable without the GLOBAL_ prefix. It
is added to the name when exporting.

I made by analogy use/cleanup/live-no-cleanup-docs.

Since both targets have long names and are needed together,
i made use/live/no-cleanup.

Use target use/live/no-cleanup should be used instead of:

@$(call set, GLOBAL_LIVE_NO_CLEANUPDB, yes)