Resolve #3586216 "Detriplicate"

Wim Leersrequested to merge
issue/canvas-3586216:3586216-detriplicate into 1.x

Closes #3586216

Detriplicate ::preSave() in Canvas config entity classes. Makes future update paths targeting component trees simpler.

Testing instructions

  • Tests still pass.
Edited by Wim Leers

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