Remove TiUP steps from TiDB test jobs

TiDB tests now use Docker images exclusively, so TiUP steps are no longer needed.

Author: zph

.github/workflows/main.yml

@@ -220,59 +220,6 @@ jobs:
           echo "version=${VERSION}" >> $GITHUB_OUTPUT
           echo "TiDB version for this test: ${VERSION}"
       
-      - name: Cache TiUP binary (shared across all TiDB tests)
-        id: cache-tiup-binary-test
-        if: contains(matrix.target, 'tidb')
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.tiup/bin
-            ~/.tiup/manifests
-          # Cache TiUP binary separately (small, ~20MB) - shared by all TiDB tests
-          key: ${{ runner.os }}-tiup-binary-${{ hashFiles('.github/workflows/main.yml') }}
-          restore-keys: |
-            ${{ runner.os }}-tiup-binary-
-      
-      - name: Cache TiDB components for this specific version
-        id: cache-tidb-version
-        if: contains(matrix.target, 'tidb')
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.tiup/components
-          # Cache components directory per version (~700-800MB per version instead of 4.5GB total)
-          # Each test job caches only the version it needs
-          key: ${{ runner.os }}-tidb-${{ steps.extract-tidb-version.outputs.version }}-${{ hashFiles('.github/workflows/main.yml') }}
-          restore-keys: |
-            ${{ runner.os }}-tidb-${{ steps.extract-tidb-version.outputs.version }}-
-      
-      - name: Install TiUP (if not cached)
-        if: contains(matrix.target, 'tidb')
-        run: |
-          if ! command -v tiup &> /dev/null; then
-            curl --proto '=https' --tlsv1.2 -sSf https://tiup-mirrors.pingcap.com/install.sh | sh
-            echo "$HOME/.tiup/bin" >> $GITHUB_PATH
-          else
-            echo "$HOME/.tiup/bin" >> $GITHUB_PATH
-          fi
-      
-      - name: Update TiUP and playground component
-        if: contains(matrix.target, 'tidb')
-        run: |
-          export PATH=$HOME/.tiup/bin:$PATH
-          tiup update --self || true
-          tiup update playground || true
-      
-      - name: Install TiDB components for this version (if not cached)
-        if: contains(matrix.target, 'tidb') && steps.cache-tidb-version.outputs.cache-hit != 'true'
-        run: |
-          export PATH=$HOME/.tiup/bin:$PATH
-          VERSION="${{ steps.extract-tidb-version.outputs.version }}"
-          echo "Installing TiDB components for v${VERSION} (cache miss)..."
-          tiup install tidb:v${VERSION} || true
-          tiup install pd:v${VERSION} || true
-          tiup install tikv:v${VERSION} || true
-          echo "TiDB v${VERSION} components installed and will be cached for next run"
 
       - name: Run tests {{ matrix.target }}
         env: