GPU/CPU particle parameter list consistency changes

[LeonStansfield]

This draft PR introduces changes to the listing of parameters for the GPU and CPU particles 2D to be more consistent with their 3D counterparts as a minor quality of life improvement, as requested in #94687

The inconsistencies I noticed that have been addressed are:

On gpu_particles_2d:

• interp_to_end are at different locations in the list between gpu_particles_3d and gpu_particles_2d
• lifetime has exponential flag in its range slider on the gpu_particles_3d, which isn't the case in gpu_particles_2d.
• preprocess has exponential flag in its range slider on the 3d version, which isn't the case in the 2d version
• Draw order is set to index by default in gpu_particles_3d but lifetime in gpu_particles_2d

And on cpu_particles_2d:

• lifetime has exponential flag in its range slider on the cpu_particles_3d, which isn't the case in cpu_particles_2d.

The changes should address these inconsistencies.

• Bugsquad edit, closes: GPUParticles2D and GPUParticles3D have inconsistent property order in inspector #94687

[LeonStansfield]

Hi everyone, is there any way to progress this PR getting reviewed and merged?

[akien-mga]

Looks good to me overall.

My only concern is with moving process_material at the end of an already long list of settings. I guess that's how it is in 3D but I always found it's hard to find even though it's such an important (the most important probably) property for GPU particles.

CC @QbieShay @paddy-exe

[akien-mga]

BTW while we wait for a second review, could you squash the commits? See PR workflow for instructions.

[QbieShay]

I see in the original PR comment you list a change of default for draw order, but I cannot see it in the PR.

I don't think we should change it.

[AThousandShips]

I see in the original PR comment you list a change of default for draw order, but I cannot see it in the PR.

Resolved above in a review comment

[paddy-exe]

LGTM. There could be people complaining that the order will be confusing but I guess it makes sense to make them consistent.
Regarding loosing the overview: Wasn't there a proposal/discussion to have a default ParticleProcessMaterial when adding a GPU/CPU Particles Node to the SceneTree?

[akien-mga]

Thanks!