#3556241: Add entity_reference_id formatter for CE displays

Arthur Lorenzrequested to merge
issue/custom_elements-3556241:3556241-entity-reference-id-formatter into 3.x

Adds a new custom element formatter that outputs the target ID of entity reference fields with configurable access checks.

Addresses review feedback:

  • Placed in main module (not extras submodule)
  • Generic formatter, not limited to 'type' fields
  • Reads target_id directly without loading entities when skip_access_check is enabled
  • Configurable skip_access_check boolean setting

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

Closes #3556241

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