The burn_in_tags scripts generates build_variants to variants that would not normally run, but we only want to run burn_in_tests on. It currently also generates a compile task for each build_variant it creates. It should not need to do this. It should be able to depend and use the artifacts from an existing build_variant.

As a server engineer,
I want burn_in_tags generated tasks to depend on existing compiles,
So that the compile work is not duplicated.

AC:

• No build_variants generated by burn_in_tags have their own compile task.