Context

According to https://tezos.gitlab.io/developer/error_monad_p4_appendices.html, we want to get rid of the infix monad operators in favour of let constructs, for readability. This MR achieves that for lib_protocol. (liquidity_baking part)

Manually testing the MR

CI green

Document the interface of any function added or modified (see the coding guidelines)
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For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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Edited Aug 17, 2023 by Gabriel Moise