Fix misc build warnings (UE 5.3)

[csciguy8]

Fixes these warnings

From CI (all UE versions)

D:\a\cesium-unreal\cesium-unreal\packages\CesiumForUnreal\HostProject\Plugins\CesiumForUnreal\Source\CesiumRuntime\Private\CesiumTileExcluderAdapter.cpp(24): warning C4996: 'ACesiumGeoreference::GetGeoTransforms': Use transformation functions on ACesiumGeoreference and UCesiumWgs84Ellipsoid instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.`

From CI (UE 5.3 builds)

D:\a\cesium-unreal\cesium-unreal\packages\CesiumForUnreal\HostProject\Plugins\CesiumForUnreal\Source\CesiumRuntime\Private\CesiumGltfPointsSceneProxy.cpp(54): warning C4996: 'FRenderResource::InitResource': InitResource now requires a command list. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.
D:\a\cesium-unreal\cesium-unreal\packages\CesiumForUnreal\HostProject\Plugins\CesiumForUnreal\Source\CesiumRuntime\Private\CesiumPointAttenuationVertexFactory.cpp(33): warning C4996: 'RHICreateBuffer': RHICreateBuffer is deprecated. Use FRHICommandListBase::CreateBuffer instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.
D:\a\cesium-unreal\cesium-unreal\packages\CesiumForUnreal\HostProject\Plugins\CesiumForUnreal\Source\CesiumRuntime\Private\CesiumPointAttenuationVertexFactory.cpp(40): warning C4996: 'RHILockBuffer': RHILockBuffer is deprecated. Use FRHICommandListBase::LockBuffer instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.
D:\a\cesium-unreal\cesium-unreal\packages\CesiumForUnreal\HostProject\Plugins\CesiumForUnreal\Source\CesiumRuntime\Private\CesiumPointAttenuationVertexFactory.cpp(54): warning C4996: 'RHIUnlockBuffer': RHIUnlockBuffer is deprecated. Use FRHICommandListBase::UnlockBuffer instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.

Local windows debug UE 5.3 builds

\cesium-unreal\Source\CesiumRuntime\Private\CesiumFeaturesMetadataComponent.cpp(544): warning C4996: 'UMaterialExpression::GetInputs': Use GetInputsView() instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile.

[j9liu]

Thanks @csciguy8 ! Will merge once CI passes.