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Tag deprecated attributes with the CompletionItemTag

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@rcjsuen is already working on this.

Since Oct 14, 2025.

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Description

compose

https://github.com/docker/docker-language-server/blob/9f2f18ea2695aaec7970d87fbc765e8d91772e7b/internal/compose/compose-spec.json#L9-L13

Some attributes in the Compose schema have been deprecated. We should tag such completion items with the Deprecated tag so that the client can render this to the user such as for the MAINTAINER keyword in a Dockerfile.

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