svm tests: enable features by default

[2501babe]

Problem

svm integration tests treat features as opt-in rather than opt-out. this is dangerous: a dev can add a feature, pass tests, enable it on all networks, and only discover it fails tests after they go to remove the feature gate

Summary of Changes

reverse this so tests must disable rather than enable features

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.7%. Comparing base (ebae35e) to head (86b8360).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6043   +/-   ##
=======================================
  Coverage    82.7%    82.7%           
=======================================
  Files         841      841           
  Lines      378317   378323    +6     
=======================================
+ Hits       313134   313171   +37     
+ Misses      65183    65152   -31     

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