[ScanDependencies] Make sure canImport
resolution agrees with import
#74199
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Fix the problem that when the only module can be found is an invalid/out-of-date swift binary module, canImport and import statement can have different view for if the module can be imported or not.
Now canImport will evaluate to false if the only module can be found for name is an invalid swiftmodule, with a warning with the path to the module so users will not be surprised by such behavior.
rdar://128876895