chore(executor): extract test utils

[rkrasiuk]

Ref #1662
Extract executor test utilities and put them behind a feature flag

[mattsse]

lgtm

[codecov-commenter]

Codecov Report

Merging #1841 (0d418fa) into main (25ac137) will decrease coverage by 0.05%.
The diff coverage is 62.50%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##             main    #1841      +/-   ##
==========================================
- Coverage   73.58%   73.53%   -0.05%     
==========================================
  Files         409      411       +2     
  Lines       50438    50438              
==========================================
- Hits        37116    37092      -24     
- Misses      13322    13346      +24     

Flag	Coverage Δ
integration-tests	19.70% <0.00%> (-0.03%)	⬇️
unit-tests	67.88% <62.50%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/executor/src/lib.rs	100.00% <ø> (ø)
crates/executor/src/test_utils/executor.rs	50.00% <50.00%> (ø)
crates/executor/src/test_utils/factory.rs	71.42% <71.42%> (ø)
crates/executor/src/blockchain_tree/mod.rs	92.53% <100.00%> (+1.64%)	⬆️

... and 4 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.