Internal cached frameworks no longer embed external SPM resource bundles

When the binary cache substitutes a cached artifact for an external SPM resource bundle, the cache no longer leaves that bundle in the Copy Bundle Resources phase of an internal source framework. The bundle target stays as a source dependency so resource traversal can keep flowing to the app-like target that actually embeds it, instead of being duplicated inside every internal framework on the way down. App-like targets still receive the bundle so runtime resource lookup keeps working.