[Flow EVM] improve handler

[ramtinms]

This PR updates the handler to check for the condition of direct message failure during deposit and withdrawal calls. This condition right now is impossible but checks have been added as extra safe guards in case of future changes break this assumption.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.76923% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 55.86%. Comparing base (bd1722d) to head (333b13d).

Files	Patch %	Lines
fvm/evm/handler/handler.go	30.76%	12 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5516      +/-   ##
==========================================
- Coverage   55.86%   55.86%   -0.01%     
==========================================
  Files        1030     1030              
  Lines      100822   100843      +21     
==========================================
+ Hits        56329    56332       +3     
- Misses      40164    40177      +13     
- Partials     4329     4334       +5     

Flag	Coverage Δ
unittests	55.86% <30.76%> (-0.01%)	⬇️

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[sideninja]

Good idea

[janezpodhostnik]

nice extra check.