Split CLI tests into smaller suite, run in parallel

Today a full run takes 1h45m.
This is mostly due to all tests running in a single go process, with parallel limited to the number of CPU cores.
If we split this monolith into 10+ test suites, running each suite as it's own process we should see a dramatic speed improvement.
We would also be able to target re-runs instead of needing to re-run all suites if a single test fails.

Investigate how we could best do this.
Github actions may be a limiting factor - could Jenkins help here?

查看现有 CLI 测试套件结构，以了解测试的组织方式。研究 Go 的测试工具，用于拆分套件和并行执行。检查当前的 GitHub Actions 工作流程，并考虑集成 Jenkins 以进行并行进程管理。确定将测试拆分为 10 个以上独立套件的标准。

由索引模型根据 Issue 内容生成。