fix rpc: handle EntryPointNotFound error correctly

[rianhughes]

closes: #2392

relevant changes are in vm.go and lib.rs. The changes in execution.rs seem to be purely formatting

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.75%. Comparing base (7b51d3a) to head (499bf40).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2555      +/-   ##
==========================================
+ Coverage   73.72%   73.75%   +0.03%     
==========================================
  Files         137      137              
  Lines       16675    16675              
==========================================
+ Hits        12293    12299       +6     
+ Misses       3525     3518       -7     
- Partials      857      858       +1     

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