AI/Tezt : Improve potential balance updates regression error messages
Following !11576 (merged), this MR provides better error messages in case of changes in balance updates because changes in the staking/reward/slashing/etc. mechanism.
Manually testing the MR
This MR does not change the test but prints potentially modified balance updates in case of an error. The test should still work as previously
dune exec tezt/tests/main.exe -- --file adaptive_issuance.ml --info