Create a LocalScope for CollectionComprehensions and generate a Declaration

[KuechA]

Fixes #2005 by

• Entering a LocalScope for list, set, dict comprehensions and generators. This somewhat simulates PEP 709 where the loop variable is available only inside the loop.
• Generating a VariableDeclaration inside this scope in the PythonAddDeclarationsPass for the variables.
• Adds test that the local variables are not accessible outside the comprehension and that the refersTo edges are set
• For AssignExpressions with the := operator inside a list/set/dict comprehension, the variable is looked up or created outside of the comprehension's LocalScope to address PEP 572

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 78.27%. Comparing base (e18a82e) to head (0bbb301).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../main/kotlin/de/fraunhofer/aisec/cpg/graph/Node.kt	60.00%	0 Missing and 2 partials ⚠️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	50.00%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...ain/kotlin/de/fraunhofer/aisec/cpg/ScopeManager.kt	83.28% <100.00%> (+0.05%)	⬆️
...otlin/de/fraunhofer/aisec/cpg/graph/TypeBuilder.kt	56.41% <100.00%> (+2.56%)	⬆️
...er/aisec/cpg/frontends/python/ExpressionHandler.kt	83.04% <100.00%> (ø)
...ofer/aisec/cpg/passes/PythonAddDeclarationsPass.kt	92.78% <100.00%> (+2.11%)	⬆️
.../main/kotlin/de/fraunhofer/aisec/cpg/graph/Node.kt	86.17% <60.00%> (-1.48%)	⬇️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	71.27% <50.00%> (-1.55%)	⬇️

... and 3 files with indirect coverage changes

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[maximiliankaul]

Looks good in general. However, there is still an issue with AssignExpressions leaking to the containing scope. See the added tests. I'm in favor of this PR once these issues are resolved.

[maximiliankaul]

LGTM.