gitaly_client: Remove unused `#list_new_blobs` function
What does this MR do and why?
The #list_new_blobs
function is unused since we have migrated all
callers to use #list_blobs
instead in commit fb65481d (repository:
Always use ListBlobs()
to enumerate new blobs, 2021-09-02). Remove the
wrapper around this RPC call such that it doesn't gain new callers and
can be removed in Gitaly.
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