[AxelRICHARD]

Exercise connector and flow creation with inherited endpoints and unrelated
owned homonyms, covering name and short-name conflicts at both ends. Fix flow-end redefinitions to identify their owning reference feature as the redefining feature instead of the whole flow.

Validate homonyms in definitions and typed occurrences, conflicts between
inherited members in either specialization order, redefinition edits and diamond inheritance without suppressing conflicting memberships.

Bug: #2603

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