[Flow EVM] Move tracing reset to OnTxEnd hook

[m-Peter]

Currently, the gas field was always set to 0x0, due to the tracing reset being done on OnTxStart:

{
      "txHash": "0xf730eacee38a28f93fcf1a9a1f9c360542fe20e3200510126976bb9ee7fd3fca",
      "result": {
        "from": "0x0000000000000000000000030000000000000000",
        "gas": "0x0",
        "gasUsed": "0x5208",
        "to": "0x2c91520ee9e2c55593dc425e1c2b82026391dea7",
        "input": "0x",
        "value": "0x18321634f200",
        "type": "CALL"
      }
    }

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.08%. Comparing base (a764d3e) to head (269053f).

❗ There is a different number of reports uploaded between BASE (a764d3e) and HEAD (269053f). Click for more details.

HEAD has 29 uploads less than BASE

Flag	BASE (a764d3e)	HEAD (269053f)
unittests	30	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6627       +/-   ##
===========================================
- Coverage   41.23%   29.08%   -12.15%     
===========================================
  Files        2054       29     -2025     
  Lines      182359     1647   -180712     
===========================================
- Hits        75188      479    -74709     
+ Misses     100867     1116    -99751     
+ Partials     6304       52     -6252     

Flag	Coverage Δ
unittests	29.08% <ø> (-12.15%)	⬇️

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