Remove congestion multiplier from calculate fee

[tao-stones]

Problem

congestion_multiplier variable in sdk::fee_structure::calculate_fee(...) does not have to do with congestion, it actually zeros out transaction fee for tests that don't handle transaction fees - those tests sets fee rate to zero in genesis config.

It is better to sync up fee_structure with fee_rate_governor during bank initialization to support those tests.

Summary of Changes

• set fee_structure.lamports_per_signature by fee_rate_governor during bank initialization
• remove congestion_multiplier in calculation_fee()

Fixes #

[tao-stones]

as Draft until rebaseed after #34821 is merged

[codecov[bot]]

Codecov Report

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

Comparison is base (a5c470d) 81.7% compared to head (d8fff7f) 81.7%. Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #34865     +/-   ##
=========================================
- Coverage    81.7%    81.7%   -0.1%     
=========================================
  Files         826      826             
  Lines      223413   223411      -2     
=========================================
- Hits       182614   182573     -41     
- Misses      40799    40838     +39