Issue #3529563: Add command to fully clear Solr index

Kateryna Lovushkinarequested to merge
issue/search_api_solr-3529563:3529563-delete-all-items-command into 4.x

This branch adds a Drush command search-api-solr:delete-all-items that fully clears the Solr index on the remote server, ensuring the Solr index matches Drupal's content state.

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