Add support for a 256*256 image, to be used in the following commit.
Define sizes in named variables instead of being hard-coded in several places in
the code.
Allow parameters `preserve_aspect_ratio` and `upper_limit` to be passed from
the different helper methods.
Factorize the code inside `image_resize_images` to make it easier to read.
Add new function to compute whether the size of an image is above a given size.
task-34045
PR: #30656
Sébastien Theys
413c63556f