Build/Test Tools: Change how BASE_TAG version is downlaoded.

Recent attempts to change the `BASE_TAG` version in the Performance Testing workflows  in [60324] and [62402] have failed due to memory exhaustion errors when trying to download the version using WP-CLI in the local Docker environment.

While the. performance tests are run within the Docker environment, there’s no hard requirement for the `wp core download` command to happen through the `wordpressdevelop/cli` conatiner. This adjusts the workflow to perform the failing WP-CLI call within the GitHub Action runner and outside of Docker to avoid the memory exhaustion issue.

Props westonruter, swissspidy.
Fixes #65289.

git-svn-id: https://develop.svn.wordpress.org/trunk@62406 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/reusable-performance-test-v2.yml

@@ -78,6 +78,7 @@ jobs:
   # - Configure environment variables.
   # - Checkout repository.
   # - Set up Node.js.
+  # - Set up PHP.
   # - Log debug information.
   # - Install npm dependencies.
   # - Install Playwright browsers.
@@ -127,6 +128,14 @@ jobs:
           node-version-file: '.nvmrc'
           cache: npm
 
+      - name: Set up PHP
+        if: ${{ inputs.subject == 'base' }}
+        uses: shivammathur/setup-php@7c071dfe9dc99bdf297fa79cb49ea005b9fcadbc # 2.37.1
+        with:
+          php-version: ${{ inputs.php-version }}
+          tools: wp-cli
+          coverage: none
+
       - name: Log debug information
         run: |
           npm --version
@@ -183,7 +192,7 @@ jobs:
         if: ${{ inputs.subject == 'base' }}
         run: |
           VERSION="${BASE_TAG%.0}"
-          npm run env:cli -- core download --version="$VERSION" --force --path="/var/www/${LOCAL_DIR}"
+          wp core download --version="$VERSION" --force --path="${LOCAL_DIR}"
 
       - name: Install object cache drop-in
         if: ${{ inputs.memcached }}