fix(executor): condition multiple precede

[hilariocoelho]

This PR fixes a behavior when multiple tasks precedes a condition, the workflow is adopting a "fan-out" behavior where the condition (and all the subsequent flow) is being executed multiple times (for each task preceding it) and all the subsequent taskflow

For the following taskflow

A -> Cond1
B -> Cond1
C -> Cond1
Cond1 -> D

The expected outcome would be all three tasks (A, B and C) are executed, then Cond1 is executed once and after the task D is executed once

The actual outcome is that all three tasks (A, B and C) are executed, then Cond1 is executed three times and after the task D is executed three times

This change didn't affect any existing unit test so, even though it is a breaking change, I don't think it affects any intended behavior.

A new unit test was introduced that ensures this fixed behavior and prevents future regressions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.07%. Comparing base (db2a424) to head (f74e8e1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   88.52%   89.07%   +0.55%     
==========================================
  Files          13       13              
  Lines         784      659     -125     
==========================================
- Hits          694      587     -107     
+ Misses         71       53      -18     
  Partials       19       19              

Flag	Coverage Δ
unittests	89.07% <100.00%> (+0.55%)	⬆️

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[noneback]

Thank you for this fix!

[noneback]

LGTM