Shell/mempool: light refactoring and cleanup
Context
This MR does small refactorings and cleanups in the mempool to prepare for !6787 (merged). See the descriptions of individual commits for more details.
Manually testing the MR
CI
Checklist
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Document the interface of any function added or modified (see the coding guidelines) - [N/A] Document any change to the user interface, including configuration parameters (see node configuration)
- [N/A] Provide automatic testing (see the testing guide).
- [N/A] For new features and bug fixes, add an item in the appropriate changelog (
docs/protocols/alpha.rstfor the protocol and the environment,CHANGES.rstat the root of the repository for everything else). -
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