Remove warnings about scope not used

[bchamagne]

Description

Remove these warnings by using Function.identify(scope):

warning: variable "scope" is unused (there is a variable with the same name in the context, use the pin operator (^) to match on it or prefix this variable with underscore if it is not meant to be used)
  nofile:5

THE ONLY RELEVANT CHANGE IS lib/archethic/contracts/interpreter/legacy/utils_interpreter.ex. The rest is to adapt the tests.

Type of change

cleanup

How Has This Been Tested?

unit tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules