ci: analyze bundle size (#13071)

This adds a new `analyze` step to our CI that analyzes the bundle size
for our `payload`, `@payloadcms/ui`, `@payloadcms/next` and
`@payloadcms/richtext-lexical` packages.

It does so using a new `build:bundle-for-analysis` script that packages
can add if the normal build step does not output an esbuild-bundled
version suitable for analyzing. For example, `ui` already runs esbuild,
but we run it again using `build:bundle-for-analysis` because we do not
want to split the bundle.

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1210692087147570

.github/workflows/main.yml

@@ -721,3 +721,37 @@ jobs:
       - run: |
           echo github.ref: ${{ github.ref }}
           echo isV3: ${{ github.ref == 'refs/heads/main' }}
+  analyze:
+    runs-on: ubuntu-latest
+    needs: [changes, build]
+    timeout-minutes: 5
+    permissions:
+      contents: read # for checkout repository
+      actions: read # for fetching base branch bundle stats
+      pull-requests: write # for comments
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Node setup
+        uses: ./.github/actions/setup
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          pnpm-version: ${{ env.PNPM_VERSION }}
+          pnpm-run-install: false
+          pnpm-restore-cache: false # Full build is restored below
+          pnpm-install-cache-key: pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+
+      - name: Restore build
+        uses: actions/cache@v4
+        with:
+          path: ./*
+          key: ${{ github.sha }}-${{ github.run_number }}
+
+      - run: pnpm run build:bundle-for-analysis # Esbuild packages that haven't already been built in the build step for the purpose of analyzing bundle size
+        env:
+          DO_NOT_TRACK: 1 # Disable Turbopack telemetry
+
+      - name: Analyze esbuild bundle size
+        uses: exoego/esbuild-bundle-analyzer@v1
+        with:
+          metafiles: 'packages/payload/meta_index.json,packages/payload/meta_shared.json,packages/ui/meta_client.json,packages/ui/meta_shared.json,packages/next/meta_index.json,packages/richtext-lexical/meta_client.json'