Remove grid check requirement to include all bands (depth, uncertainty, density)

[lachlanhurst]

QAX plugins MBES Grid Checks and Finder Grid Checks require all three bands (depth, uncertainty, density) to be present when running checks. Some of these checks do not require all bands.

QA check plugins should be updated to require only the needed input bands. If a check is executed on a file missing required bands the execution status in the output qajson should be aborted with a relevant error message being included (eg; "Density check requires density band that was missing from input dataset testfile.tif")