[Vectorize] Add changelog entry for the Vectorize list-vectors operation (#24708)

Author: garvit-gupta

src/content/changelog/vectorize/2025-08-26-vectorize-list-vectors.mdx

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+---
+title: List all vectors in a Vectorize index with the new list-vectors operation
+description: Enumerate all vector identifiers in your Vectorize indexes for bulk operations, auditing, and data migration.
+date: 2025-08-26
+products:
+  - vectorize
+---
+
+You can now list all vector identifiers in a Vectorize index using the new `list-vectors` operation. This enables bulk operations, auditing, and data migration workflows through paginated requests that maintain snapshot consistency.
+
+The operation is available via Wrangler CLI and REST API. Refer to the [list-vectors best practices guide](/vectorize/best-practices/list-vectors/) for detailed usage guidance.