Fix CI issues

[ViralBShah]

Linux x86 and Windows x64 runners in CI seem to have some infrastructure issues:

https://github.com/SciML/Sundials.jl/actions/runs/17417995538

cc @thazhemadam @ChrisRackauckas

[ViralBShah]

x86 Linux:

warning: julia signal alt stack could not be allocated (StackOverflowError will be fatal on this thread).

warning: julia signal alt stack could not be allocated (StackOverflowError will be fatal on this thread).

warning: julia signal alt stack could not be allocated (StackOverflowError will be fatal on this thread).

warning: julia signal alt stack could not be allocated (StackOverflowError will be fatal on this thread).
(julia) malloc: Cannot allocate memory

[2360264] signal 6 (-6): Aborted
in expression starting at none:0
Allocations: 1 (Pool: 1; Big: 0); GC: 0

[ViralBShah]

x64 Windows does not precompile:

ERROR: LoadError: The following 1 direct dependency failed to precompile:

Sundials --code-coverage=@d:\a\Sundials.jl\Sundials.jl --color=yes --check-bounds=yes --warn-overwrite=yes --depwarn=yes --inline=yes --startup-file=no --track-allocation=none --check-bounds=yes --compiled-modules=yes --depwarn=yes

Failed to precompile Sundials [c3572dad-4567-51f8-b174-8c6c989267f4] to "C:\Users\runneradmin\.julia\compiled\v1.11\Sundials\jl_E943.tmp".
ERROR: LoadError: could not load symbol "SUNContext_Create":
The specified procedure could not be found.
Stacktrace:
[1] SUNContext_Create
@ D:\a\Sundials.jl\Sundials.jl\lib\libsundials_common.jl:6 [inlined]
[2] ContextHandle
@ D:\a\Sundials.jl\Sundials.jl\src\handle.jl:273 [inlined]
[3] __init(prob::SciMLBase.ODEProblem{Vector{Float64}, Tuple{Float64, Float64}, true, SciMLBase.NullParameters, SciMLBase.ODEFunction{true, SciMLBase.AutoSpecialize, FunctionWrappersWrappers.FunctionWrappersWrapper{Tuple{FunctionWrappers.FunctionWrapper{Nothing, Tuple{Vector{Float64}, Vector{Float64}, SciMLBase.NullParameters, Float64}}}, false}, LinearAlgebra.UniformScaling{Bool}, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, typeof(SciMLBase.DEFAULT_OBSERVED), Nothing, Nothing, Nothing, Nothing}, @kwargs{}, SciMLBase.StandardODEProblem}, alg::Sundials.ARKODE{:Newton, :Dense, :Dense, Sundials.Implicit, Nothing, Nothing, Nothing, Nothing}, timeseries::Vector{Any}, ts::Vector{Any}, ks::Vector{Any}; verbose::Bool, callback::Nothing, abstol::Float64, reltol::Float64, saveat::Vector{Float64}, tstops::Vector{Float64}, d_discontinuities::Vector{Float64}, maxiters::Int64, dt::Nothing, dtmin::Float64, dtmax::Float64, timeseries_errors::Bool, dense_errors::Bool, save_everystep::Bool, save_idxs::Nothing, dense::Bool, save_on::Bool, save_start::Bool, save_end::Bool, save_timeseries::Nothing, progress::Bool, progress_steps::Int64, progress_name::String, progress_message::typeof(DiffEqBase.ODE_DEFAULT_PROG_MESSAGE), progress_id::Symbol, advance_to_tstop::Bool, stop_at_next_tstop::Bool, userdata::Nothing, alias_u0::Bool, kwargs::@kwargs{})

[ViralBShah]

Just checking if we are able to fix CI to be able to run the failing platforms.

[ViralBShah]

Windows fixed in #498. x86 testing should just be disabled - it seems to have issues in Symbolics.

[oscardssmith]

we possibly should wait a week to see if Aayush's massive incoming Symbolics changes fix things.

[ViralBShah]

Can always add x86 back and rerun CI. However, I don't think this package sets up 32-bit calling correctly anyways, independent of Symbolics. sunindextype won't be Int64 on 32-bit platforms - so this is all hardcoded.

We do not OOM any more on x86 though. #498 somehow fixed that.