DEV: Fix the order of operations in themes-frontend (#27317)

Previously "themes frontend" CI job would:

1. pull compatible versions of themes that happened to be in the base image
2. clone all official themes (overriding the compatible versions from 1.)
3. run tests

.github/workflows/tests.yml

@@ -147,12 +147,8 @@ jobs:
           key: ${{ runner.os }}-plugin-gems-${{ steps.container-envs.outputs.ruby_version }}-${{ steps.container-envs.outputs.debian_release }}-${{ hashFiles('plugins/*/plugin.rb') }}
 
       - name: Checkout official themes
-        if: matrix.target == 'themes' && matrix.build_type == 'system'
-        run: bin/rake themes:clone_all_official
-
-      - name: Pull compatible versions of themes
         if: matrix.target == 'themes'
-        run: bin/rake themes:pull_compatible_all
+        run: bin/rake themes:clone_all_official themes:pull_compatible_all
 
       - name: Add hosts to /etc/hosts, otherwise Chromium cannot reach minio
         if: matrix.build_type == 'system' && matrix.target == 'core'