Use FORWARD_MODEL in poly-example

[berland]

No need to use the keyword SIMULATION_JOB that no users use.

Issue
Resolves an itch

Approach
do-it

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure tests pass locally (after every commit!)

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.88%. Comparing base (d8b17e4) to head (e379b4c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8694      +/-   ##
==========================================
- Coverage   90.90%   90.88%   -0.02%     
==========================================
  Files         343      343              
  Lines       21271    21271              
==========================================
- Hits        19336    19333       -3     
- Misses       1935     1938       +3     

Flag	Coverage Δ
gui-tests	76.11% <ø> (-0.01%)	⬇️
integration-tests	53.38% <ø> (-0.04%)	⬇️
unit-tests	68.99% <ø> (-0.01%)	⬇️

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[andreas-el]

💯