Remove support for `Dependency<Handle, T[size]>`.

It was planned for certain pending code, but passing initialization of a
`Dependency` through `Initializer` cannot support arrays well.

Why? While a parameter typed as a reference to an array can accept a bare
braced-init-list, this does not work if the parameter type is merely convertible
from an array (similarly to `std::initializer_list<T>`). This means that all
classes potentially working with array types would need to explicitly handle
accepting references to arrays in addition to generically accepting
`Initializer<T>` as they do now.

For example `StableDependency` would need to explicitly handle array types for
feature parity with `Dependency`.

This is not worth the effort.

`std::array<T, size>`, `Dependency<Handle, T (&)[size]>`, and
`Dependency<Handle, T (&&)[size]>` work without special handling.

PiperOrigin-RevId: 627752265