Setting in CE display for enabling building using Layout Builder.

Layout Builder is only used if a (new) setting in the corresponding CE display is enabled.

Closes #3455414

config/schema/custom_elements.schema.yml

@@ -22,9 +22,12 @@ custom_elements.entity_ce_display.*.*.*:
     mode:
       type: string
       label: 'View or form mode machine name'
+    forceLayoutBuilder:
+      type: bool
+      label: 'Build custom element using layout (if enabled in appropriate display).'
     forceAutoProcessing:
       type: bool
-      label: 'When true, ignore this config and fall back to using processors'
+      label: 'Build custom element using processors instead of field config.'
     customElementName:
       type: string
       label: 'Custom element name'