[LB] Adds LB changelog

src/content/changelogs/load-balancing.yaml

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+---
+link: "/load-balancing/changelog/"
+productName: Load Balancing 
+productLink: "/load-balancing/"
+productArea: Application performance
+productAreaLink: /fundamentals/reference/changelog/performance/
+entries:
+  - publish_date: "2025-01-16"
+    title: Update to Pool Health Monitoring
+    description: |-
+      We made changes to how we resolve and monitor proxied origins to assess pool health. Our analysis indicates no impact to customer configurations or operations. Contact support if you notice any unexpected behavior.
+  - publish_date: "2024-12-20"
+    title: Load Balancing with the China Network
+    description: |-
+      You can now enable load balancers to be deployed to the [China Network](/china-network/). Refer to the [documentation](/load-balancing/additional-options/load-balancing-china/) for more details. 

src/content/docs/load-balancing/changelog.mdx

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+---
+pcx_content_type: changelog
+title: Changelog
+changelog_file_name:
+  - load-balancing
+sidebar:
+  order: 153
+---
+
+import { ProductChangelog } from "~/components";
+
+{/* <!-- Actual content lives in /src/content/changelogs/waiting-room.yaml. Update the file there for new entries to appear here. For more details, refer to https://developers.cloudflare.com/style-guide/documentation-content-strategy/content-types/changelog/#yaml-file --> */}
+
+<ProductChangelog />