* feat: add validation to require consistent category color
* feat: reflect color requirement in new category form
* refactor: move logic inline over shared component
* rubocop
* tests: fix breaking and add case for new validation
* feat: hide color selector when parent category selected
* feat: override color with parent color in model
* tests: remove case for unnecessary validation
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Signed-off-by: Julien Bertazzo Lambert <42924425+JLambertazzo@users.noreply.github.com>