rowsPerImage_and_bytesPerRow tests fail for ASTC formats with 3D dimension

[beaufortfrancois]

Similarly to #4381, webgpu:api,operation,command_buffer,image_copy:rowsPerImage_and_bytesPerRow:*format="astc*";dimension="3d" tests fail when adding experimental texture-compression-astc-sliced-3d feature support at https://ci.chromium.org/ui/p/chromium/builders/try/dawn-mac-arm64-deps-rel/14805/test-results?sortby=&groupby=

They hit the following error:

EXCEPTION: Error: Unexpected validation error occurred: Texture size 
  ([Extent3D width:3072, height:36, depthOrArrayLayers:2]) exceeded maximum texture size
  ([Extent3D width:2048, height:2048, depthOrArrayLayers:2048]).

However, there are other errors such as the following:

EXPECTATION FAILED: subcase: bytesPerRowPadding=15;rowsPerImagePadding=17;copyWidthInBlocks=256;copyHeightInBlocks=3;copyDepth=2
Array had unexpected contents at indices 0 through 178687.
 Starting at index 0:
   actual == 0x: 12 14 1c 30 56 94 f0 75 24 03 18 69 01 dc 0f 91 72 b3 5f 77 06 0d 92 a0 3d 6a 32 96 a1 59 bf de bc 5f c8 ...
   failed ->     xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx ...
 expected ==     01 03 0b 1f 45 83 df 64 13 ed 07 58 eb cb f9 80 61 a2 4e 66 f0 f7 81 8f 2c 59 21 85 90 48 ae cd ab 4e b7 ...
  at (elided: only 2 shown)

This suggests there is something going on with the test itself. @greggman Could you provide help there?

[beaufortfrancois]

Fixed with #4383