[ModuleInterface] Determine package-only resolution need based on input mode #78867
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This fixes behavior introduced in #77686 for implicitly-built modules.
In implicit builds, implicit interface build sub-invocations inherit their parent invocation's requested action, which means the code was failing to detect that we were building an interface, not source, and erroneously resulted in enabling in-package module dependency resolution.
Resolves rdar://143505814