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joshlf changed the title [derive] Improve hygeine testing [derive] Improve hygiene testing

In zerocopy-derive tests, import `zerocopy` as `zerocopy_renamed` so
that references to `::zerocopy` fail to resolve. This ensures that no
generated code hard-codes `zerocopy` or `::zerocopy`, and instead all
references make use of the provided custom crate name.

gherrit-pr-id: G3cb376b3f2d996151636f7aebb3a33f4134162e6