Proto/bench: append proto name to proto benches

Context

Fixes #1975 (closed)

In order to run benchmarks from previous protocols, since they need a unique name to be correctly registered, we append the name of the protocol to the name of the benchmark. We usually do this in lib_benchmarks_proto by calling the module Registration_helpers instead of Registration. This MR makes this change to the new benchmarks from proto_011 that didn't follow this rule.

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, the Development Version section of CHANGES.md for everything else).
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