ci: remove Tarantool tests from LuaJIT integration

After the commit 3daf2399 ("ci: fix step parameters for
reusable runs") it is now possible to create Tarantool
integration workflows for any repository in the Tarantool
organization. Considering this, we don't need to run Tarantool
tests under the old target for the LuaJIT integration in
.test.mk and we can leave only LuaJIT tests in this target for
the sake of exotic Tarantool builds testing.

NO_DOC=CI
NO_TEST=CI
NO_CHANGELOG=CI