Upstream: Ensure that swift_synthesize_interface_aspect generates unique outputs
#1526
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Cherry-pick: 634d0d1
The aspect generated a file named
<target>.synthesized.swift, which was incorrect if a target had multiple modules in itsSwiftInfo.direct_modulesfield. It would also be incorrect to just switch to<module name>.synthesized.swift, because two targets could potentially re-export the same module.To fully disambiguate, we create an intermediate directory named for the target, and then use the module name as the filename in that directory.
PiperOrigin-RevId: 740414505