Try to fix QueryTree IDs

[KuechA]

Currently, the ID of a QueryTree is based on the node it relates to, the QueryTree's value and the IDs of the children. This means that, if multiple QueryTrees relate to the same node and have equal children (e.g. false or no children at all), they all share the same ID. In the Codyze Web UI, there is no way to distinguish them and results may be displayed in a weird way (i.e., one of these nodes will be displayed multiple times, instead of displaying all of the nodes).

I'm trying to make this a bit less likely by including the string representation into the ID as well. Are there any other fields that we can/should include here? If I remember correctly, using the parent node was somewhat problematic due to our logic suppressing results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.52%. Comparing base (977182a) to head (17f7df0).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
.../kotlin/de/fraunhofer/aisec/cpg/query/QueryTree.kt	69.27% <100.00%> (+0.19%)	⬆️

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