Fixing Cubed Sphere Scalar Tracer

[cshsgy]

• Fixed cubed sphere tracer transport communication issues
• Turned off the decomposition for scalars but kept on for hydro variables

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.17%. Comparing base (5c04146) to head (b8990d1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   99.17%   99.17%           
=======================================
  Files          31       31           
  Lines        1574     1574           
=======================================
  Hits         1561     1561           
  Misses         13       13           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.