Drop texture clear_views in surface_texture_discard

[rajveermalviya]

Fixes #4056

Checklist

• Run cargo clippy.
• Run cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Connections
#4056

Description
The texture clear_views weren't destroyed in surface_texture_discard and that resulted in dangling VkImageViews.

Testing
Tested locally (on Linux) with repro mentioned in #4056

[rajveermalviya]

This does fix the vulkan validation errors but still there is a weird behaviour, with the repro in #4056 if frame skip is triggered more than 3 times (not necessarily consecutive triggers): get_current_texture starts returning SurfaceError::Timeout unless the surface is reconfigured.

[cwfitzgerald]

That's because discard isn't implemented:

wgpu/wgpu-hal/src/vulkan/instance.rs

Line 912 in 50cfc54

unsafe fn discard_texture(&mut self, _texture: super::SurfaceTexture) {}

[cwfitzgerald]

More specifically, I'm not sure there's a meaningful way to implement discard at the hal level - we likely need to keep the image around at the core level and reuse it next time acquire is called.

[rajveermalviya]

Hmm, in that case let's see how much I can grep.

[cwfitzgerald]

We can leave that to a follow up if that would be easier

[rajveermalviya]

We can leave that to a follow up if that would be easier

Yeah, lets do that

[cwfitzgerald]

Noice