Error printing changes for watch (#5389)

* Move CliError to nu-protocol

clean up comment

* Enable printing errors instead of just returning them

* Nicer Miette error printing in watch command

crates/nu-cli/src/util.rs

@@ -1,8 +1,8 @@
-use crate::CliError;
 use log::trace;
 use nu_engine::eval_block;
 use nu_parser::{escape_quote_string, lex, parse, unescape_unquote_string, Token, TokenContents};
 use nu_protocol::engine::StateWorkingSet;
+use nu_protocol::CliError;
 use nu_protocol::{
     engine::{EngineState, Stack},
     PipelineData, ShellError, Span, Value,