ci: deduplicate language setup (#7753)

* Deduplicate actions

* Split up go-race and go-pg

.github/actions/setup-node/action.yaml

@@ -0,0 +1,15 @@
+name: "Setup Node"
+description: |
+  Sets up the node environment for tests, builds, etc.
+runs:
+  using: "composite"
+  steps:
+    - uses: buildjet/setup-node@v3
+      with:
+        node-version: 16.16.0
+        # See https://github.com/actions/setup-node#caching-global-packages-data
+        cache: "yarn"
+        cache-dependency-path: "site/yarn.lock"
+    - name: Install node_modules
+      shell: bash
+      run: ./scripts/yarn_install.sh