Do not throw away backpack instantiations for module lookup cache
Currently, there is only one home package so this probably doesn't matter. But if we support multiple home packages, they could differ only in arguments (same indef component being applied).
It looks like it used to be this way before 4e8a0607, but that commit doesn't seem to comment on this change in the particular. (It's main purpose is creating the InstalledUnitId and recategorizing the UnitId expressions accordingly.)
Trying this as a separate commit for testing purposes. I leave it to others to decide whether this is a good change on its own.
- are either individually buildable or squashed
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