Remove congestion_multiplier in fee calculation

[tao-stones]

remove congestion_multiplier; update test bank fee_structure with genesis_config

Problem

Summary of Changes

Fixes #

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0e8f2de) 81.7% compared to head (1d3a8bb) 81.7%. Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #34788     +/-   ##
=========================================
- Coverage    81.7%    81.7%   -0.1%     
=========================================
  Files         825      825             
  Lines      223249   223274     +25     
=========================================
+ Hits       182609   182610      +1     
- Misses      40640    40664     +24     

[tao-stones]

in fav of https://github.com/solana-labs/solana/pull/34865, and bunch of test hardening PRs before it.