build: remove global polyfill and add conditions for worker (#350)

# Motivation

Remove global polyfill and add conditions in esbuild for better compatibility with web worker.

# Notes

I found this change in esbuild repo discussion [#1189](evanw/esbuild#1189) and implemented in in Juno friday to fix the compatibility with web workers [#37](junobuild/juno-js#37).

I have packaged all libs and tested in NNS-dapp.

scripts/esbuild.mjs

@@ -58,8 +58,9 @@ const buildEsmCjs = () => {
       minify: true,
       splitting: true,
       format: "esm",
-      define: { global: "window" },
       target: ["esnext"],
+      platform: "browser",
+      conditions: ["worker", "browser"],
       external: [
         ...Object.keys(commonPeerDependencies),
         ...Object.keys(workspacePeerDependencies),