[workers-observability] fix build errors

Author: rohinlohe

src/content/changelog/workers/2025-03-25-gzip-source-maps.mdx

@@ -6,6 +6,8 @@ products:
 date: 2025-03-25T12:00:00Z
 ---
 
+import { WranglerConfig } from "~/components";
+
 Source maps are now Generally Available (GA). You can now be uploaded with a maximum gzipped size of 15 MB.
 Previously, the maximum size limit was 15 MB uncompressed.
 

src/content/docs/workers/observability/source-maps.mdx

@@ -6,7 +6,8 @@ description: Adding source maps and generating stack traces for Workers.
 
 ---
 
-import { Render, WranglerConfig } from "~/components"
+import { Render, WranglerConfig } from "~/components";
+import { FileTree } from "@astrojs/starlight/components";
 
 <Render file="source-maps" product="workers" />