Fix paragraph blocks not appearing in Layout Builder until layout saved

Bas Vredelingrequested to merge
issue/paragraph_blocks-3346580:3346580-lb_ui_blocks_cache_issues into 4.x

Layout Builder's tempstore can hold stale entity data, causing newly added paragraphs to not appear in the block selection UI until the layout is saved.

  • Add loadFreshEntity() method to load entity directly from database
  • Update getRefererEntity() to bypass tempstore cached entity
  • Update ParagraphBlock::getLatestParagraph() to fallback to fresh entity when paragraph not found
  • Remove unused getLatestEntityRevision() method and related code

Closes #3346580

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