Since garbage collection of texture pools happens every time
`drw_manager_init` is called, interleaved calls to different
`DRW_draw`/`DRW_render` functions can result in a constant cycle of
creating/releasing textures.
This PR changes texture pools to only release textures that have not
been used for N garbage collection cycles.
I chose 8 as default since I think is high enough to avoid the issue
while it's unlikely to cause any major spike in memory consumption.
Pull Request: https://projects.blender.org/blender/blender/pulls/113024
0ed6172833