Speed up the lint and test task by doing pnpm install instead of full setup (#39760)

.github/workflows/pr-lint-js.yml

@@ -22,8 +22,22 @@ jobs:
         steps:
             - uses: actions/checkout@v3
 
-            - name: Setup WooCommerce Monorepo
-              uses: ./.github/actions/setup-woocommerce-monorepo
+            - name: Setup PNPM
+              uses: pnpm/action-setup@c3b53f6a16e57305370b4ae5a540c2077a1d50dd
+              with:
+                  version: '8.6.7'
+
+            - name: Setup Node
+              uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c
+              with:
+                  node-version-file: .nvmrc
+                  cache: pnpm
+                  registry-url: 'https://registry.npmjs.org'
+
+            - name: Install prerequisites
+              run: |
+                  # ignore scripts is faster, and postinstall should not be needed for lint.
+                  pnpm install --ignore-scripts
 
             - name: Lint
               run: pnpm run -r --filter='release-posts' --filter='woocommerce/client/admin...' --filter='@woocommerce/monorepo-utils' --filter='!@woocommerce/e2e*' --filter='!@woocommerce/api' --color lint

.github/workflows/pr-test-js.yml

@@ -1,4 +1,4 @@
-name: Lint and tests for JS packages and woocommerce-admin/client
+name: Run tests for JS packages and woocommerce-admin/client
 
 on:
     pull_request:
@@ -11,7 +11,7 @@ concurrency:
 permissions: {}
 
 jobs:
-    lint-test-js:
+    test-js:
         name: Run JS Tests
         runs-on: ubuntu-20.04
         permissions:
@@ -19,8 +19,22 @@ jobs:
         steps:
             - uses: actions/checkout@v3
 
-            - name: Setup WooCommerce Monorepo
-              uses: ./.github/actions/setup-woocommerce-monorepo
+            - name: Setup PNPM
+              uses: pnpm/action-setup@c3b53f6a16e57305370b4ae5a540c2077a1d50dd
+              with:
+                  version: '8.6.7'
+
+            - name: Setup Node
+              uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c
+              with:
+                  node-version-file: .nvmrc
+                  cache: pnpm
+                  registry-url: 'https://registry.npmjs.org'
+
+            - name: Install prerequisites
+              run: |
+                  # ignore scripts is faster, and postinstall should not be needed for tests.
+                  pnpm install --ignore-scripts
 
             - name: Test
               run: pnpm run test --filter='woocommerce/client/admin...' --filter='@woocommerce/monorepo-utils' --filter='!@woocommerce/e2e*' --filter='@woocommerce/monorepo-utils' --filter='!@woocommerce/api' --color