transformations: (lower-csl-stencil) Send only core data

[n-io]

Small fix to only send core data to neighbours.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.04%. Comparing base (4af2e1c) to head (0887471).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3223   +/-   ##
=======================================
  Coverage   90.04%   90.04%           
=======================================
  Files         433      433           
  Lines       54568    54571    +3     
  Branches     8465     8466    +1     
=======================================
+ Hits        49135    49138    +3     
  Misses       4060     4060           
  Partials     1373     1373           

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