testutil/compose: rename compose config

[corverroos]

Renames charon-compose.yml to config.json in order to differentiate and distinguish it from docker-compose.yml.

category: refactor
ticket: #568

[codecov]

Codecov Report

Merging #590 (7079943) into main (969dc9a) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #590      +/-   ##
==========================================
+ Coverage   54.81%   54.88%   +0.07%     
==========================================
  Files          95       95              
  Lines        8898     8890       -8     
==========================================
+ Hits         4877     4879       +2     
+ Misses       3320     3314       -6     
+ Partials      701      697       -4     

Impacted Files	Coverage Δ
testutil/compose/config.go	100.00% <ø> (ø)
testutil/compose/run.go	76.66% <ø> (ø)
testutil/compose/define.go	54.05% <100.00%> (+0.76%)	⬆️
testutil/compose/lock.go	62.50% <100.00%> (+1.78%)	⬆️
app/app.go	60.70% <0.00%> (ø)
core/qbft/qbft.go	82.57% <0.00%> (+0.87%)	⬆️

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[xenowits]

LGTM🚀