feature: add e2e test for command line tools such as restate-cli and restatectl

[lsytj0413]

Ref: #3009

I know there's a crate called assert_cmd that can be used to test command-line tools. However, I'm not sure if it's suitable for the current scenario. I'll explore it and see.

cc @tillrohrmann

[lsytj0413]

/assign