Calling `step()` on EditorProgress too often will slow down the
rest of the editor, so it's best avoided. This is also more consistent
with other exporters, as most of them don't report per-file progress
either.
Exporting a 2D project with ~1,100 files to Android now takes
about 10 seconds from a debug editor build instead of 65 seconds.
This closes#30850.
(cherry picked from commit 2dd3a01d11)
9a8455f5a7