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Drop Enumerable from Grape::Exceptions::ValidationErrors (#2747)

`Grape::Exceptions::ValidationErrors` mixed in `Enumerable` and exposed
a public `#each` that yielded `(attribute, error)` pairs. That surface
was undocumented (the README only covers `#errors`, `#full_messages`,
`#message`, and `rescue_from`), untested, and had a single in-class
consumer: `#full_messages` calling `map` on `self`.

Removed `include Enumerable` and `#each`. Rewrote `#full_messages` to
walk the `errors` hash directly via `flat_map`, which also documents
the actual data shape (`{ params => [validations] }`) at the call site.

UPGRADING entry added since this is a contract break, even if the
surface was undocumented.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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