[clang-tools-extra] [clangd][RFC] Add container field to remote index Refs grpc method (PR #71605)

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tdupes wrote:

Updated the relevant remote marshalling tests. Please let me know if there are any further testing I should do. I am using this with an unordinary remote grpc service so if there is some integration test or manual process I can test the clangd-indexer & remote server on I would be happy to do further testing 

https://github.com/llvm/llvm-project/pull/71605