JSEP: Use global-agent in scripts to enable using network proxy (#22537)

This PR add dependency to the global-agent package, and use it in JSEP
scripts that download files from network (i.e. `js/scripts/utils.ts` and
`js/web/script/pull-prebuilt-wasm-artifacts.ts`), so that user can make
these script use network proxy by setting environment variable
GLOBAL_AGENT_HTTPS_PROXY.

js/package.json

@@ -1,6 +1,7 @@
 {
   "devDependencies": {
     "@types/fs-extra": "^11.0.2",
+    "@types/global-agent": "^2.1.3",
     "@types/mocha": "^10.0.2",
     "@types/node": "^18.14.6",
     "@types/npmlog": "^4.1.4",
@@ -17,6 +18,7 @@
     "eslint-plugin-prefer-arrow": "^1.2.3",
     "eslint-plugin-unicorn": "^48.0.1",
     "fs-extra": "^11.1.1",
+    "global-agent": "^3.0",
     "jszip": "^3.10.1",
     "mocha": "^10.2.0",
     "npmlog": "^7.0.1",