test: version clash w/ diamond deps #11155
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This PR adds a test replicating Kim's diamond dependency example.
The top-level package,
D, depends on two intermediate packages,BandC, which each require semantically different versions of another package,A. The portion ofAthatBandCpublicly use is unchanged across the versions, but they both privately make use of changed API. Currently, this causes a version clash. This will be made to work without error later this quarter.