fix(ci): install uv in release workflow prepare steps

The create.test.ts tests require uv for Python project scaffolding.
The Build and Test workflow installs it via astral-sh/setup-uv, but
the release workflow's prepare steps were missing it, causing test
failures during the snapshot update step.

Author: aidandaly24

.github/workflows/release-main-and-preview.yml

@@ -99,6 +99,9 @@ jobs:
         with:
           node-version: 20.x
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
       - name: Configure git
         run: |
           git config --global user.name "github-actions[bot]"
@@ -198,6 +201,9 @@ jobs:
         with:
           node-version: 20.x
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
       - name: Configure git
         run: |
           git config --global user.name "github-actions[bot]"