fix: show --help message for CLI errors, add tests for delete (#1403)

* feat(cli): add test for delete

This adds a new test for the `delete` command to ensure it works as
expected when provided the correct args.

* fix(cli): use ExecuteC() to match Cobra

This modifies the `cli.Root().Execute()` to `cli.Root).ExecuteC()` to
match the default behavior of Cobra. We do this so errors will always
print the "run --help" line.

* feat(cli): add WithoutParameters test for delete

This adds a new test to the `delete_test.go` suite to ensure the correct
behavior occurs when `delete` is called without an argument.

* fixup! feat(cli): add WithoutParameters test for delete

* refactor(cli): show --help error message on main

This adds an error message which shows when there is an error with any
commands called to improve the UX.

* fixup! refactor(cli): show --help error message on main

* refactor(cli): handle err with FormatCobraError

This adds a new helper function called `FormatCobraError` to `root.go`
so that we can colorize and add "--help" message to cobra command errors
like calling `delete`.

* refactor(cli): add root_test.go, move delete test

cmd/coder/main.go

@@ -14,12 +14,13 @@ import (
 
 func main() {
 	dadjoke()
-	err := cli.Root().Execute()
+	cmd, err := cli.Root().ExecuteC()
 	if err != nil {
 		if errors.Is(err, cliui.Canceled) {
 			os.Exit(1)
 		}
-		_, _ = fmt.Fprintln(os.Stderr, cliui.Styles.Error.Render(err.Error()))
+		cobraErr := cli.FormatCobraError(err, cmd)
+		_, _ = fmt.Fprintln(os.Stderr, cobraErr)
 		os.Exit(1)
 	}
 }