twoliter: refactor repetitive setup code

[webern]

We are doing this too many times:

        let project = project::load_or_find_project(self.project_path.clone()).await?;
        let toolsdir = project.project_dir().join("build/tools");
        install_tools(&toolsdir).await?;

@webern can you suggest a way to factor out the load_or_find_project and install_tools logic so we don't need to repeat for every command?

Originally posted by @bcressey in https://github.com/bottlerocket-os/twoliter/pull/230#discussion_r1610786772