[ScanDependency] Allow continue searching for testable module #73227
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When swift dependency scanner first finds a binary module for a testable import, verify if the module is built for enable-testing or not. If not, keeps searching in case there is a second testable binary module in the search path.
Previously, the first binary module will always be accepted by scanner and rely on the importer to provide a good diagnostics. Now the scanner will emit a warning before continue searching, so user understands why the binary in the search path is not taken.