[Bug]: credential issues when running e2e tests

### Expected Behavior

e2e tests should be able to run

### Actual Behavior

> Retry validateCredentials: attempt 1 of 12 failed: Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers. Retrying after 35ms.

https://github.com/aws/aws-durable-execution-sdk-java/actions/runs/27803033732/job/82393927371?pr=468

### Steps to Reproduce

- someone without the permission created a PR
- e2e workflow for this PR fail

### SDK Version

N/A

### Java Version

17

### Is this a regression?

No

### Last Working Version

_No response_

### Additional Context

_No response_

从失败的 GitHub Actions 运行以及仓库的 e2e workflow 配置入手，重点关注当 pull request 由没有所需权限的人创建时凭据如何提供。比较 workflow 对有权限和无权限贡献者的行为；当这类 pull request 能够成功运行 e2e 测试且不会出现凭据加载失败时，即表示完成。

由索引模型根据 Issue 内容生成。