Handle InitializerListExpressions as variables of ComprehensionExpressions in the DFG

[KuechA]

Adapts the ControlFlowSensitiveDFGPass to handle multiple declarations and references in the variable of ComprehensionExpressions. To enhance the readability, the logic is moved to an own function.

Fixes #1957, #2017

Blocked by #2019

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 78.03%. Comparing base (3a7107a) to head (0f679a3).

Files with missing lines	Patch %	Lines
...er/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt	57.14%	7 Missing and 2 partials ⚠️

❌ Your patch check has failed because the patch coverage (57.14%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

Files with missing lines	Coverage Δ
...er/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt	78.42% <57.14%> (-1.72%)	⬇️

... and 2 files with indirect coverage changes

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