[NFC] Remove Unused Module Parameter to Conformance Lookup #38753
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It's been quite a long time since this unused parameter was introduced.
The intent is to produce the module as a root for the search - that is,
computing the set of conformances visible from that module, not the set
of conformances inside of that module. Callers have since been providing
all manner of module-scoped contexts to it.
Let's just get rid of it. When we want to teach protocol conformance
lookup to do this, we can revert this commit as a starting point and try
again.