[Discussion] How to check `@Http.Private.includeInapplicableMetadataInPayload`

It relates to issue https://github.com/Azure/typespec-azure/issues/3179
At present, all SDK emitter does not include property of `@path` or `@query` in response body. As an attempt to solve this issue in SDK emitter, we tried to change the code to include property of `@path` or `@query` in response body.

But then, we encountered the inconsistency from this `@Http.Private.includeInapplicableMetadataInPayload`.

A few [ARM resources](https://github.com/Azure/typespec-azure/blob/main/packages/typespec-azure-resource-manager/lib/models.tsp#L66-L67) are decorated with this decorator,

And typespec-autorest will not include property of `@path` or `@query` for them.
Its impl uses `metadataInfo.isPayloadProperty`
https://github.com/Azure/typespec-azure/blob/bf889cb66efc41cf733f796f40c2784de291cc0b/packages/typespec-autorest/src/openapi.ts#L1971-L1979
[isPayloadProperty](https://github.com/weidongxu-microsoft/typespec/blob/4fd451fb69dfca4fcb54e01358c6823befe11b9f/packages/http/src/metadata.ts#L667)

As SDK emitter, we'd like to know, whether we also need to use this `metadataInfo.isPayloadProperty`?

If yes, we likely need some change in TCGC to give this information to emitters.