[lucasmerlin]

This PR exists to test kitdiff's PR features. Do not merge it.

Open it in kitdiff: https://rerun-io.github.io/kitdiff/?url=https://github.com/rerun-io/kitdiff/pull/35

It changes the snapshots of the kittest tests in tests/snapshots in every way we could think of. Each case has its own commit:

Commit	File	What kitdiff should show
Change a snapshot	home.png	A red box in the diff
Change a snapshot below the diff threshold	viewer_blend_all.png	"All differences below threshold!" (5 pixels, each off by 1)
Change the size of a snapshot	viewer_old.png	"Diff failed: Images must have the same dimensions" (1000×600 → 1000×560)
Change a whole snapshot	viewer_click_in_file_tree.png	Every pixel differs (inverted colors)
Change only the alpha of a snapshot	viewer_filter.png	Same colors, 50% alpha
Remove a snapshot	viewer_new.png	Only an old image
Rename a snapshot	viewer_diff.png → viewer_diff_view.png	The same image on both sides
Move and change a snapshot	viewer_next_snapshot.png → selection/viewer_next.png	A removed and an added file: git can't detect renames of changed git-lfs files, as the pointer changes completely
Change only the file mode of a snapshot	viewer_pixel_size.png (chmod +x)	No difference
Add snapshots with special paths and formats	added/new snapshot äöü #1.png, added/deeply/nested/folder/nested.png, added/grayscale_16bit.png	Percent-encoded paths, a deep folder, a 16-bit grayscale PNG
Change a file that is not in git-lfs	tests/fixtures/widgets/button.new.png	Loads from raw.githubusercontent.com, not media.githubusercontent.com
Add a snapshot larger than 1 MB	large/noise.png (~3 MB)	Loads. The contents API handles files over 1 MB differently
Add a broken PNG	added/broken.png (text)	An error for this file only
Add files that are not PNGs	notes.md, photo.jpg	Nothing: kitdiff only lists .png files
Add 120 snapshots	bulk/bulk_000.png … bulk_119.png	More than one page (100) of PR files. Good for testing how fast you can skip through the snapshots

viewer_magnifier.png does not change, so kitdiff must not list it.

The snapshot tests fail on this PR, so CI uploads a test-results artifact. That tests opening artifacts from the commit list. The "Commit the updated snapshots" button will fail: update_kittest_snapshots.yml does not exist in this repository yet.

The base branch is lucas/github-file-loader, which adds the snapshot tests.

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