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Return the elements of an Array params scope that are not a Hash from declared (#2935)

`declared` filters each element of an Array scope down to its declared
keys by building an empty copy of the element (`passed_params.class.new`)
and filling it. An element that is not a Hash has no keys, and copying it
raised: `NoMethodError` for `nil`, `false` and numbers, and a `TypeError`
for a String, which then got indexed with a Symbol. The request answered
500.

Validation lets such an element through wherever nothing in the scope is
required of it:

    optional :items, type: Array do   # blank elements are passed over
      requires :id, type: Integer
    end

    requires :tags, type: Array do    # nothing to check on a non-Hash
      optional :label, type: String
    end

so `{"items": [null, {"id": 1}]}` or `{"tags": ["x", {"label": "y"}]}`
got past validation and then broke the endpoint calling `declared`.

Such an element is now returned as it came in, the way a leaf value is.
The test is `respond_to?(:key?)`, the one `declare_leaf` already uses, so
a Hash-like object that is not a Hash is still filtered.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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