Various updates to fuzz testing

[slundqui]

• Set open trades to be 75% of calc max
• Path independence check effective share reserves has a tolerance of 1e-4
• Path independence sets variable interest to 0 for closing trades only
• Remove hyperdrive balance test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (972cd92) 80.49% compared to head (c1d3c55) 80.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1249   +/-   ##
=======================================
  Coverage   80.49%   80.49%           
=======================================
  Files          94       94           
  Lines        5332     5332           
=======================================
  Hits         4292     4292           
  Misses       1040     1040           

Flag	Coverage Δ
unittests	80.49% <ø> (ø)

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[dpaiton]

lgtm