chore(ci): replace local uv setup action with astral-sh/setup-uv@v6 (#8491)

* chore: remove setup-uv action configuration file as it is no longer needed

* chore: update setup-uv action to use the official action across all workflows

* chore: disable cache pruning in all workflows to improve build stability

* chore: update Python version to 3.13 and add pre-release description in workflows

.github/workflows/codeflash.yml

@@ -23,11 +23,15 @@ jobs:
         with:
           fetch-depth: 0
       - name: "Setup Environment"
-        uses: ./.github/actions/setup-uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+          cache-dependency-glob: "uv.lock"
+          python-version: ${{ matrix.python-version }}
+          prune-cache: false
       - run: uv sync
       - name: Run Codeflash Optimizer
         working-directory: ./src/backend/base
         continue-on-error: true
         run: uv run codeflash
-      - name: Minimize uv cache
-        run: uv cache prune --ci
+