Failure to connect should result into an error with ftl deploy

[jvmakine]

> ftl deploy --endpoint=http://localhost:4678/
info:alice:build: Building module
info:alice:build: Module built (1.99s)
info:alice:deploy: Deploying module
◞[alice] 
>

It seems that the deploy is a success, even if there is nothing listening to port 4678.

We should give a clear error that the CLI failed to connect.

[wesbillman]

It seems like wrapped errors aren't getting reported correct when using kctx.FatalIfErrorf(err)

In cli/main.go we have this when calling Run on commands

err = kctx.Run(ctx)
kctx.FatalIfErrorf(err)

If I update this to the following, I then see the messages being printed out:

err = kctx.Run(ctx)
if err != nil {
	fmt.Fprintf(os.Stderr, "ftl: %+v\n", err)
	os.Exit(1)
}