Prevent model compilation on custom propagate functions

[rusty1s]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.57%. Comparing base (13d8198) to head (cad88c1).
Report is 3 commits behind head on master.

Files	Patch %	Lines
torch_geometric/nn/conv/message_passing.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9079      +/-   ##
==========================================
- Coverage   89.99%   89.57%   -0.43%     
==========================================
  Files         469      469              
  Lines       30118    30122       +4     
==========================================
- Hits        27106    26983     -123     
- Misses       3012     3139     +127     

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