[TRACKER] Vulkan Mobile backend-specific issues

[Calinou]

This issue tracks issues specific to the Vulkan (Forward) Mobile backend (such as bugs and undocumented missing features), regardless of the host platform.

See also https://github.com/godotengine/godot/issues/39033, which is specific to Android-only issues. See also https://github.com/godotengine/godot/issues/66458, which is specific to issues only present in the 4.x OpenGL renderer.

### Bugs
- [x] https://github.com/godotengine/godot/issues/55253
- [ ] https://github.com/godotengine/godot/issues/55867
- [ ] https://github.com/godotengine/godot/issues/55868
- [x] https://github.com/godotengine/godot/issues/55870
- [ ] https://github.com/godotengine/godot/issues/55878
- [ ] https://github.com/godotengine/godot/issues/55879
- [x] https://github.com/godotengine/godot/issues/55881
- [ ] https://github.com/godotengine/godot/issues/55882
- [x] https://github.com/godotengine/godot/issues/55892
- [ ] https://github.com/godotengine/godot/issues/55900
- [x] https://github.com/godotengine/godot/issues/55901
- [x] https://github.com/godotengine/godot/issues/56555
- [x] https://github.com/godotengine/godot/issues/58631
- [x] https://github.com/godotengine/godot/issues/59047
- [x] https://github.com/godotengine/godot/issues/65848
- [x] https://github.com/godotengine/godot/issues/69908
- [x] https://github.com/godotengine/godot/issues/70231
- [ ] https://github.com/godotengine/godot/issues/70774
- [x] https://github.com/godotengine/godot/issues/71606
- [ ] https://github.com/godotengine/godot/issues/73401
- [ ] https://github.com/godotengine/godot/issues/73827
- [ ] https://github.com/godotengine/godot/issues/75956
- [ ] https://github.com/godotengine/godot/issues/77295
- [ ] https://github.com/godotengine/godot/issues/67234
- [ ] https://github.com/godotengine/godot/issues/82263
- [ ] https://github.com/godotengine/godot/issues/84846
- [ ] https://github.com/godotengine/godot/issues/85172
- [ ] https://github.com/godotengine/godot/issues/87644

### Documentation
- [x] https://github.com/godotengine/godot/issues/55880

### Enhancements
- [ ] https://github.com/godotengine/godot/issues/53731
- [ ] https://github.com/godotengine/godot/issues/76774

[mrjustaguy]

Lights don't render on Mobile in github artifacts, tho work fine (with forced lambert shading) on Remi's Pre-Alphas

[Calinou]

Lights don't render on Mobile in github artifacts, tho work fine (with forced lambert shading) on Remi's Pre-Alphas

Directional and point lights seem to render fine on my end (check the issues with screenshots I created today). This is with the default settings.

[mrjustaguy]

Here I've made an issue https://github.com/godotengine/godot/issues/55892 with the current Nightly Build. I suspect GPU architectural issues if people on newer GPUs don't have this issue.

[SimplyPhy]

Should this [and #39033] be with Milestone 4.0? Or perhaps 4.1.

[Calinou]

Should this [and #39033] be with Milestone 4.0? Or perhaps 4.1.

I added milestone 4.0. However, I can't promise that all Vulkan mobile rendering bugs will be fixed for 4.0 – some of those will have to wait for 4.1.