Fix forloop variables scoping for closures

[tarilabs]

After reading about this article, I noticed analogous behaviour was present in the DMN FEEL implementation.

FEEL for-loop variable scope was not maintained at iteration level; as a result, any closure inside the for-loop would capture loop variable instances of the "last iteration". This is not the intended behaviour.

With this PR:

• Provides a reproducer (see test case).
• Provides a fix.
• Screenshot of all test passing is provided due to current limitations on CI/CD for convenience:
  

Adding 2 committers for review, per PPMC directive.

Ports: @baldimir to evaluate as needed

referenced Pull Requests: none

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[yesamer]

Thank you @tarilabs!

[tarilabs]

Rebased as requested.