🐛 useEnumInitializers should not emit diagnostics in ambient namespaces

[Conaclos]

Environment information

main branch.

What happened?

The following code should not emit diagnostics:

declare namespace X {
  enum Enum {
    A,
    B,
  }
}

Here the namespace creates an ambient context, making Enum an ambient enum.
The rule thinks that Enum is a concrete enum.

Note that the issue is recursive:

export declare namespace X {
    export namespace Y {
        export enum Enum {
            A,
            B,
        }
    }
}

See this example in the playground.

Expected result

Enum should be recognized as an ambient enum and thus the rule should ignore the enum.

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