change default concurrent workers in orkestra charts from 20 to 5

[mahalrs]

Closes #278

Change the default concurrent workers in the orkestra charts values.yaml file from 20 to 5.

[nitishm]

This is great!! Welcome to the Orkestra community 🎉🎉🎉

[codecov-commenter]

Codecov Report

Merging #280 (fb6bf9d) into main (525863d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #280   +/-   ##
=======================================
  Coverage   35.53%   35.53%           
=======================================
  Files           6        6           
  Lines         982      982           
=======================================
  Hits          349      349           
  Misses        604      604           
  Partials       29       29           

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