Further automate build and release process

We also have partially automated the release process in GitHub Actions but haven't reached the level of automation that we have for Windows and Azure Pipelines.

Currently run_release requires humans to click around in the GitHub UI to manually execute the GitHub workflow, which wasn't the case before. We also lost the automatic local testing step in favor of testing on GitHub Actions, but local assurance is good to have for RMs.

• Further automate kicking off the build and release workflows on GitHub Actions.
• Automatically detect workflow completion and download artifacts from GitHub Actions.
• Add back local testing to run_release.py script once artifacts are automatically downloaded.

cc @ambv

从 run_release.py 脚本以及参与 build 和 release 的 GitHub Actions 工作流开始。追踪当前如何处理工作流完成和构建产物，然后确定被移除的本地测试步骤。完成的标准是能够检测工作流并自动下载构建产物，同时在 run_release.py 中恢复本地测试。