[TRACKER] ReflectionProbe issues

[Calinou]

This is a tracker issue for reflection probes in the master branch. See https://github.com/godotengine/godot/issues/55328 for VoxelGI issues and https://github.com/godotengine/godot/issues/55327 for SDFGI issues. See https://github.com/godotengine/godot/issues/56080 for issues specific to the CPU-based BakedLightmap in 3.x.

This tracker only tracks issues in the master branch, not 3.x.

### Bugs
- [x] https://github.com/godotengine/godot/issues/38442
- [ ] https://github.com/godotengine/godot/issues/49117
- [ ] https://github.com/godotengine/godot/issues/50195
- [ ] https://github.com/godotengine/godot/issues/50751
- [ ] https://github.com/godotengine/godot/issues/56635
- [ ] https://github.com/godotengine/godot/issues/56657
- [ ] https://github.com/godotengine/godot/issues/60019
- [ ] https://github.com/godotengine/godot/issues/64683
- [ ] https://github.com/godotengine/godot/issues/65690
- [x] https://github.com/godotengine/godot/issues/66624
- [ ] https://github.com/godotengine/godot/issues/92877

### Enhancements
- [ ] https://github.com/godotengine/godot/issues/49789
- [x] https://github.com/godotengine/godot/issues/54449
- [ ] https://github.com/godotengine/godot-proposals/issues/2784
- [ ] https://github.com/godotengine/godot-proposals/issues/2934
- [ ] https://github.com/godotengine/godot-proposals/issues/3013
- [ ] https://github.com/godotengine/godot-proposals/issues/3045
- [ ] https://github.com/godotengine/godot-proposals/issues/3744
- [ ] https://github.com/godotengine/godot-proposals/issues/4733
- [ ] https://github.com/godotengine/godot-proposals/issues/4739
- [ ] https://github.com/godotengine/godot-proposals/issues/4782
- [ ] https://github.com/godotengine/godot-proposals/issues/6180

### Pull requests
- [ ] https://github.com/godotengine/godot/pull/55929

[mrjustaguy]

https://github.com/godotengine/godot/issues/50195 is missing