Move template_render.py up two levels

[berland]

The subdirectories serve no real purpose. There is not going to be a lot of other forward models in here.

Issue
Resolves #my_issue

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• 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 unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

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

[eivindjahren]

🆙

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.55%. Comparing base (0ca8b0b) to head (f125862).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8988      +/-   ##
==========================================
- Coverage   91.57%   91.55%   -0.02%     
==========================================
  Files         347      347              
  Lines       21397    21397              
==========================================
- Hits        19594    19590       -4     
- Misses       1803     1807       +4     

Flag	Coverage Δ
cli-tests	39.60% <ø> (-0.01%)	⬇️
gui-tests	73.55% <ø> (+<0.01%)	⬆️
performance-tests	50.19% <ø> (-0.03%)	⬇️
unit-tests	80.11% <ø> (-0.02%)	⬇️

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