[WIP] Fix Symbolics related stuff

[TorkelE]

Update, right now this one covers most stuff symbolics/equation related.

• Replaced Symbolics.istree with TermInterface.iscall.
• Reactivated tests that should no longer be broken due to a recent Symbolcis update.
• Updates compats for new Symbolics.
• Remove SymboliUtils dependency, and all function calls of it (where possible).
• Introduces the new hasnode and replacenode symbolic functions (instead of _occursin and replace).

[TorkelE]

Issue for the SDE thing: SciML/ModelingToolkit.jl#2754

[isaacsas]

Fine to merge once runtests.jl is updated.

[isaacsas]

Should this be good now that MTK has been updated (modulo updating runtests here)?

[TorkelE]

Turns out that StructuralIdentifiability is not compatible with the latest versions (although just checking the project.toml file it should be, so might be some of its dependencies which is causing it): SciML/StructuralIdentifiability.jl#326

Later today I plan to temporarily disable the SI extension and stuff so that it all passes. Then when SI is updated (which I imagine and hope will be soon), it should be a very quick thing to add it back in.

[isaacsas]

Shouldn’t this also bump MTK and Symbolics to the latest versions that have SymbolicUtils V2 support?

[TorkelE]

yes it should

[isaacsas]

Cool, feel free to merge when you are done then. Once this is merged I will continue with some doc updates, but I want to wait until I can build with SymbolicUtils V2.

[TorkelE]

Will merge as soon as everything has passed.