[TD] Remove credentials requirement for retrieval (pytorch#122279)

Made the bucket readable by public
https://s3.console.aws.amazon.com/s3/buckets/target-determinator-assets?region=us-east-1&bucketType=general&tab=permissions

The only jobs that matter here are the retrieval and td jobs, which were both successful

Pull Request resolved: pytorch#122279
Approved by: https://github.com/huydhn

.github/workflows/llm_td_retrieval.yml

@@ -57,12 +57,6 @@ jobs:
           cd ../codellama
           pip install -e .
 
-      - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v3
-        with:
-          role-to-assume: arn:aws:iam::308535385114:role/gha_target_determinator_s3_read
-          aws-region: us-east-1
-
       - name: Fetch CodeLlama Checkpoint
         shell: bash -l {0}
         run: |