refactor(docs-infra): extract only the visibleRegion

Previously we extracted the regions and only made the visible region visible on the page, but since there is not a need for the
non-visible code to be presented, we don't need to include it in the generated code snippets.

(cherry picked from commit 9b3b5fb4cf)

adev/shared-docs/pipeline/shared/marked/extensions/docs-code/format/region.mts

@@ -24,8 +24,6 @@ export function extractRegions(token: CodeToken) {
     if (!region) {
       throw new Error(`Cannot find ${token.visibleRegion} in ${token.path}!`);
     }
-    token.visibleLines = `[${region.ranges.map(
-      (range) => `[${range.from}, ${range.to ?? parsedRegions.totalLinesCount + 1}]`,
-    )}]`;
+    token.code = region.lines.join('\n');
   }
 }