Added missing ParallelExecutable flag to node and nodes fields

[glen-84]

Summary of the changes (Less than 80 chars)

• Added missing ParallelExecutable flag to node and nodes fields.

Closes #7635

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📓 Notes:

• The change in Added flags for node and nodes field. #7556 resulted in the default field flag of ParallelExecutable being removed for the node and nodes fields.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.78%. Comparing base (9e86b1b) to head (134d012).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7661      +/-   ##
==========================================
- Coverage   73.79%   73.78%   -0.01%     
==========================================
  Files        2922     2922              
  Lines      150895   150895              
  Branches    17549    17549              
==========================================
- Hits       111349   111337      -12     
- Misses      33724    33737      +13     
+ Partials     5822     5821       -1     

Flag	Coverage Δ
unittests	73.78% <ø> (-0.01%)	⬇️

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