Backport relevant baker's alpha changes to mumbai's baker

Context

This MR backports the existing changes of the protocol alpha's baker into the mumbai's one. It does not import the dal-specific code. It is necessary for coming-up MRs.

Manually testing the MR

Diff the alpha baker directory and the mumbai's one

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, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR