Moved `IteHandler` into the preprocessing pipeline#858

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Tomaqa wants to merge 8 commits intopreprocess-countersfrom

fix-internal-term-names

Commits on Dec 6, 2025

Unit tests on unsat cores with top-level ITE terms that are internally changed
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Regression tests on unsat cores with terms that may internally be changed
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Moved preprocessing of ITE terms into the preprocessing pipeline
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Refactored preprocessing of ITE terms into separate function
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Making sure IteHandler is not called repeatedly on the already seen formulas
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Do not postpone preprocessing of ITEs when UF is combined with LA
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Explicitly including used STL headers in MainSolver.h
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Added cache for the preprocessing of ITE terms
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