feat: Add option to hide help text at the end

It can be a little confusing when running stackablectl within scripts. The help text can look like a command didn't run correctly, when it did and the help text is suggesting what to do next:

We could either add an option to disable the help text, or just hide it if CI=true (which we can then export in the getting_started.sh scripts).

For reference, Terraform uses an env var TF_IN_AUTOMATION to control the help text output.

首先定位 stackablectl 输出末尾帮助文本的位置，以及它如何处理 CLI 选项或环境变量。将提议的显式选项和基于 CI 的行为与 Terraform 的 TF_IN_AUTOMATION 参考进行比较；完成的标准是，所选的自动化行为能够抑制容易误导的帮助文本，同时不影响正常的交互式输出，并且如果选择该方案，还要更新 getting_started.sh。