refactor(evals): Use clean target dependency and clean dist before build

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Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: brandonkachen

evals/project.json

@@ -12,7 +12,8 @@
       },
       "outputs": ["{projectRoot}/dist"],
       "dependsOn": [
-        "^build"
+        "^build",
+        "clean"
       ]
     },
     "run-eval-set": {