layers: image transfer granularity check fixes

[cdwfs]

• Use appropriate VUIDs for all checks
• Update tests to check for VUIDs instead of message substrings
• Image granularity tests should be also be run on compressed images. They're mostly redundant with existing compressed-format-only checks, but I can't convince myself that they're always redundant, and the spec doesn't say to skip them.
• Removed comments that the checks should be moved elsewhere; IMO they're fine where they are, but I welcome second opinions.
• Compressed-format alignment checks should also apply to _422 single-plane formats.

[tobine]

@Whenning42 I believe this overlaps with your current work. Please review and update your work to build on these changes.