[Backport #2003 to 5.x] Map array<K, V> to type: object + additionalProperties

[github-actions]

Automated backport of #2003 to branch 5.x.

Do not modify this pull request.

Closes #2001

Summary

• TypeInfoTypeResolver now maps array<K, V> (with explicit key type) to type: object + additionalProperties instead of type: array + items
• array<T>, T[], list<T> (default int|string key) keep existing type: array + items behaviour
• ArrayShapeType (e.g. array{foo:bool}) also correctly resolves to type: object + additionalProperties
• LegacyTypeResolver is not affected — it continues to produce type: array + items for all array types

Test plan

• TypeResolverTest — 152 tests pass (both 3.0.0 and 3.1.0, both legacy and type-info resolvers)
• AugmentPropertiesTest — map assertion merged into testTypedProperties
• Nested array<int, T> in union types correctly produces object + additionalProperties

[github-actions]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-2003-to-5.x
git worktree add --checkout .worktree/backport-2003-to-5.x backport-2003-to-5.x
cd .worktree/backport-2003-to-5.x
git reset --hard HEAD^
git cherry-pick -x f66289ab9c9c3a1cf70222e0bebbe7c6c7109f2f