updated proposer logic for maxEB

[rolfyone]

Added test to show that the consolidation factor affects the proposals in an epoch.

Proposer index 3 went from 0 proposals in epoch 1 up to 4 proposals in epoch 1 after this change (consolidation of 16, so it has 16x32 eth)

Documentation

• [X] I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• [X] I thought about adding a changelog entry, and added one if I deemed necessary.

[rolfyone]

We'll need to update reftests before this will be clean by the looks.