[Tidy first] rename node, realnode to unique_id, node in selector_methods.py

[gshank]

Tidy first change: rename node, realnode to unique_id, node in selector_methods.py

[codecov]

Codecov Report

Attention: Patch coverage is 95.71429% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.05%. Comparing base (02d7727) to head (c006f73).

Files	Patch %	Lines
core/dbt/graph/selector_methods.py	95.71%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9837      +/-   ##
==========================================
- Coverage   88.12%   88.05%   -0.07%     
==========================================
  Files         178      178              
  Lines       22458    22458              
==========================================
- Hits        19790    19775      -15     
- Misses       2668     2683      +15     

Flag	Coverage Δ
integration	85.41% <71.42%> (-0.17%)	⬇️
unit	61.78% <77.14%> (ø)

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[emmyoop]

Such a satisfying cleanup.