Issue #3614504: Fix TypeError in indexItems() from undeclared $skipDeleteItemIds property

Zeeshaan khannrequested to merge
issue/ai_vdb_provider_postgres-3614504:3614504-indexitems-throws-typeerror-on-array-diff-because-skipdeleteitemids-is-never-declared into 1.0.x

Closes #3614504 Declares $skipDeleteItemIds with an empty array default so array_diff() in indexItems() no longer receives null.

AI was used to help investigate and test. Reviewed and fixed manually.

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