baker: use only consensus operation with minimal slot

Context

Operations with non-minimal slot can be accepted by the mempool since !7815 (merged) and !7927 (merged). This MR allow the baker to only filter operations with minimal slot for the (pre)quorum.

Furthermore, this MR also allow the baker to count only once consensus operations with identical contents but different branches for (pre)quorum.

Fixes https://gitlab.com/tezos/tezos/-/issues/5093.

Manually testing the MR

Ci green. (more tests to come in !8085 (merged)?)

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