use get_processes_latest for workgraph.update

[superstar54]

• use get_processes_latest for workgraph.update
• serialize task.process in to_dict
• handle data node and process ndoe differently
  • when loading the WorkGraph and reading outputs of the tasks
  • When setting the results of the task in the context of the Engine

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.80%. Comparing base (01007f4) to head (5c74088).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   75.28%   75.80%   +0.52%     
==========================================
  Files          69       69              
  Lines        4616     4608       -8     
==========================================
+ Hits         3475     3493      +18     
+ Misses       1141     1115      -26     

Flag	Coverage Δ
python-3.11	75.71% <100.00%> (+0.52%)	⬆️
python-3.9	75.78% <100.00%> (+0.52%)	⬆️

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