Add Max Parallelism into flytewf

[RRap0so]

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• I updated the documentation accordingly.
• All new and existing tests passed.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.99%. Comparing base (4643e2a) to head (e78bb49).
Report is 112 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5527   +/-   ##
=======================================
  Coverage   60.99%   60.99%           
=======================================
  Files         794      794           
  Lines       51475    51477    +2     
=======================================
+ Hits        31398    31400    +2     
  Misses      17185    17185           
  Partials     2892     2892           

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.73% <100.00%> (+<0.01%)	⬆️
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	68.03% <ø> (ø)
unittests-flyteidl	79.04% <ø> (ø)
unittests-flyteplugins	61.85% <ø> (ø)
unittests-flytepropeller	57.30% <ø> (ø)
unittests-flytestdlib	65.59% <ø> (ø)

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[RRap0so]

Test confirms this is not needed.