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[ftr/asyncInstance] fix error thrown for undefined provider instances (…
…elastic#22689) When a FTR service is created async the promise created by its provider is wrapped in a [`Proxy`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Proxy) that checks before each property access if the instance has finished initializing. This breaks if the service provider returns undefined, which is the case for the `failureDebugging` service, because our truthy check will fail and we throw the error claiming the service is uninitialized, which is probably incorrect. This PR updates the proxy to use a `Symbol` to indicate when a service instance is not available yet and throws a different error when the proxy receives any request (get, set, etc.) and the service instance is not an object, as required by the Reflect APIs.
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