Add testing util CheckScopeVar

[fmoletta]

A single generic function to check that the execution scopes contains a certain value and its is equal to an expected value. Made to reduce boilerplate code in hint unit tests

[codecov-commenter]

Codecov Report

Merging #308 (f0d2396) into main (1697359) will decrease coverage by 0.37%.
Report is 3 commits behind head on main.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #308      +/-   ##
==========================================
- Coverage   56.40%   56.04%   -0.37%     
==========================================
  Files          47       48       +1     
  Lines        5992     6247     +255     
==========================================
+ Hits         3380     3501     +121     
- Misses       2286     2398     +112     
- Partials      326      348      +22     

Files	Coverage Δ
pkg/hints/hint_utils/testing_utils.go	79.48% <0.00%> (-20.52%)	⬇️

... and 4 files with indirect coverage changes

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