Deprecate AI Search in favour for the contrib version
<!-- Please search existing work items before filing to avoid duplicates. --> <!-- Also check open feature request work items to avoid duplicating existing proposals. --> ## Summary The AI Search module provided in the AI Core module should be deprecated in light of the AI Search module provided in contrib: https://www.drupal.org/project/ai_search We'll need a change record for this change. ## Problem The AI Search module in contrib should be prioritized rather than the one provided by the AI Core module. <!-- Describe the problem this feature would solve. What is currently difficult, missing, or frustrating? Who would benefit, and how? Be specific — "site builders who configure LLM providers" is more useful than "users". --> ## Proposed solution *(optional)* Deprecate the AI Search module in the AI Core module, and refer to the contrib version instead, similar to the approach taken with the AI Translate module: https://www.drupal.org/node/3570275
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