Replace the ECA-based duplicate workflow with a native ConfirmFormBase...

Kostiantynrequested to merge
issue/ai_context-3577426:3577426-redo-context-item into 1.0.x

Replace the ECA-based duplicate workflow with a native ConfirmFormBase implementation. This resolves the version conflict with Drupal CMS 2.0 (eca ^2.1 vs ^3.0.8).

  • Add AiContextItemDuplicateForm using createDuplicate()
  • Add duplicate-form link template and route
  • Add Duplicate operation to list builder
  • Remove eca:eca_content, eca:eca_misc, eca:eca_render dependencies
  • Remove drupal/eca from composer.json
  • Delete ECA workflow config
  • Add update hook to clean up ECA config on existing installs
  • Remove ECA modules from kernel test

Closes #3577426

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