Do not infer graph_model node types based on variable Op class

[ricardoV94]

Closes #5766

Major / Breaking Changes

• ...

Bugfixes / New features

• Do not show SymbolicRandomVariables as deterministics in model_graph

Docs / Maintenance

• ...

[codecov]

Codecov Report

Merging #6259 (8084ef8) into main (b0d1066) will increase coverage by 29.80%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6259       +/-   ##
===========================================
+ Coverage   64.39%   94.20%   +29.80%     
===========================================
  Files         101      102        +1     
  Lines       21465    21472        +7     
===========================================
+ Hits        13823    20227     +6404     
+ Misses       7642     1245     -6397     

Impacted Files	Coverage Δ
pymc/model_graph.py	78.82% <100.00%> (+12.15%)	⬆️
pymc/tests/stats/test_convergence.py	100.00% <0.00%> (ø)
pymc/model.py	89.47% <0.00%> (+0.27%)	⬆️
pymc/step_methods/metropolis.py	83.47% <0.00%> (+0.41%)	⬆️
pymc/distributions/shape_utils.py	97.85% <0.00%> (+0.42%)	⬆️
pymc/math.py	70.04% <0.00%> (+0.48%)	⬆️
pymc/distributions/distribution.py	95.00% <0.00%> (+2.27%)	⬆️
pymc/aesaraf.py	94.04% <0.00%> (+2.33%)	⬆️
pymc/tests/distributions/util.py	90.86% <0.00%> (+2.46%)	⬆️
pymc/backends/arviz.py	90.08% <0.00%> (+4.54%)	⬆️
... and 57 more