When deploying Next.js utilize esbuild via NPX (#5336)

* Drop esbuild as a dependency of firebase-tools
* Spawn npx esbuild to bundle next.config.js when deploying a Next.js application
* Widen the net on externals, we were missing deps of deps

Author: jamesdaniels

CHANGELOG.md

@@ -1,3 +1,4 @@
+- Remove esbuild dependency, instead bundle Next.js configuration on deploy with NPX (#5336)
 - Add sharp NPM module to Cloud Functions when using Next.js Image Optimization (#5238)
 - Adds user-defined env vars into the functions emulator (#5330).
 - Support Next.js Middleware (#5320)