grpc: RepoList: actually persist "repos" field when converting to protobuf message #644
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Fixes: https://github.com/sourcegraph/sourcegraph/issues/56342
The repos field wasn't actually propagated properly to the protobuf message - it was hardcoded to an empty slice.
This PR also adds a fuzz test to catch this error. I needed to use https://github.com/AdaLogics/go-fuzz-headers for this since neither go 1.18 fuzzing (no struct support) or quick/check (no support for unexported fields) works for this usecase.