[test] Baseline test: Re-add .cache to measure performance WITH cache

This commit temporarily restores .cache caching to establish a baseline
for performance comparison. The next commit will remove it again to
measure the performance impact.

Testing approach:
1. This commit: WITH .cache (baseline)
2. Next commit: WITHOUT .cache (comparison)
3. Analysis: Compare CI run times to quantify cache impact

.github/workflows/release-draft-create.yaml

@@ -32,6 +32,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: |
+            .cache
             tsconfig.tsbuildinfo
           key: release-tools-cache-${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
           restore-keys: |