build(nodejs): suppress expected empty-import-meta warning in CJS build

The CJS build intentionally produces empty import.meta — our runtime
code detects this and falls back to createRequire. Silence the esbuild
warning to avoid confusing contributors.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

nodejs/esbuild-copilotsdk-nodejs.ts

@@ -26,6 +26,7 @@ await esbuild.build({
     target: "es2022",
     sourcemap: false,
     outExtension: { ".js": ".js" },
+    logOverride: { "empty-import-meta": "silent" },
 });
 
 // Mark the CJS directory so Node treats .js files as CommonJS