GH200 Warnings

[aaadelmann]

Problem
GH200 Warnings are larger architectural fixes. The 50-warnings are reduce to 11 visible locations.

Root cause: host-owning Field objects are copied into host/device expressions or lambdas. Their generated device destructors then try to call the host-only Field::~Field().

Main paces:

• LagrangeSpace.hpp (line 1432): KOKKOS_CLASS_LAMBDA expands to [=, *this], copying the entire LagrangeSpace, including resultField.

• IpplOperations.h (line 304): meta_grad, meta_laplace, meta_curl, and meta_hess store const E u_m, where E can be a complete Field.

• LaplaceHelpers.h (line 43): the Poisson expression objects have the same ownership pattern.

Ideas:

• Replace KOKKOS_CLASS_LAMBDA in LagrangeSpace with ordinary KOKKOS_LAMBDA captures of its existing lightweight DeviceStruct, views, and scalar data.

• Make field-expression nodes store a device-safe view adapter rather than an owning Field.

• Do not mark Field::~Field() as device-callable and do not suppress warning 20011; its host-owned members are genuinely unsuitable for device destruction.

Note
This needs extensive and careful checking beyond our test, i.e. LandauDamping with FEM solver