Support RPC specific error details when generically unwrapping structured Gitaly errors
What does this MR do and why?
Some RPCs in Gitaly have RPC specific error detail types that wrap the set of details that the RPC is capable of returning (example). When this wrapper detail type is used, Rails is unable to generically decode the underlying detail and map to the correct error.
We are updating the Rails so that RPC error details can be generically mapped to the correct error type.
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Related to #443732 (closed)
Edited by Mustafa Bayar