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254784 Fix Lab channel render in canvas and Channels docker

Amy spark requested to merge (removed):amyspark/254784-fix-lab-channel-canvas into master

This moves the channel rendering code to a KoColorSpace function named convertChannelToVisualRepresentation, implemented in KoColorSpaceAbstract and overriden in Lab colorspaces.

This function now handles copying channel values and, where necessary, renormalizes it so as to fit the valid channel range (as with Lab).

As a bonus, I also fixed scaleToU8 in Lab because it needed the same renormalization procedure.

Thanks to Wolthera for the initial pseudopatch -- the missing part was the canvas code.

BUG: 254784

Edited by Amy spark

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