fix(executors): Initialize cls in Workflow.from_file

[AndreyMarkinPPC]

Instead of initializing from Workflow class - thus making open for inheriting from Workflow

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.67%. Comparing base (5ebb9d2) to head (4ec73d1).
⚠️ Report is 285 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #484      +/-   ##
==========================================
+ Coverage   88.23%   90.67%   +2.44%     
==========================================
  Files          61       85      +24     
  Lines        2600     4570    +1970     
==========================================
+ Hits         2294     4144    +1850     
- Misses        306      426     +120     

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