Implement alwaysComesFrom

[KuechA]

We're missing the reverse form of alwaysFlowsTo

[codecov]

Codecov Report

❌ Patch coverage is 4.13223% with 116 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.27%. Comparing base (f1a2fc8) to head (593e01f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...otlin/de/fraunhofer/aisec/cpg/query/FlowQueries.kt	4.46%	106 Missing and 1 partial ⚠️
...kotlin/de/fraunhofer/aisec/cpg/graph/Extensions.kt	0.00%	9 Missing ⚠️

❌ Your patch check has failed because the patch coverage (4.13%) 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
...kotlin/de/fraunhofer/aisec/cpg/graph/Extensions.kt	61.26% <0.00%> (-1.01%)	⬇️
...otlin/de/fraunhofer/aisec/cpg/query/FlowQueries.kt	65.73% <4.46%> (-24.44%)	⬇️

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