[move] PoF tiebreaker randomize tied bids, maintain fewer seats than bidders

[soaresa]

• Reduces the number of seats after boot-up threshold, improving bid competition between qualified bidders #251.
• Shuffles validator addresses with the same bid value after bubble sort, ensuring randomness and fixing issue #271.
• Fixes problems related to subsidy allocation for validators' reward payments as described in issue #241.

Test Coverage	Previous Value	New Value
Proof of Fee	87.31%	90.21%
Musical Chairs	75.74%	79.50%

TODO: rebase with main