add rendered and json error messages in try/catch (#14082)

# Description

This PR adds a couple more options for dealing with try/catch errors. It
adds a `json` version of the error and a `rendered` version of the
error. It also respects the error_style configuration point.

![image](https://github.com/user-attachments/assets/32574f07-f511-40c0-8b57-de5f6f13a9c4)


# User-Facing Changes
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helps us keep track of breaking changes. -->

# Tests + Formatting
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crates/nu-engine/src/eval_ir.rs

@@ -220,8 +220,17 @@ fn eval_ir_block_impl<D: DebugContext>(
             }
             Err(err) => {
                 if let Some(error_handler) = ctx.stack.error_handlers.pop(ctx.error_handler_base) {
+                    let fancy_errors = match ctx.engine_state.get_config().error_style {
+                        nu_protocol::ErrorStyle::Fancy => true,
+                        nu_protocol::ErrorStyle::Plain => false,
+                    };
                     // If an error handler is set, branch there
-                    prepare_error_handler(ctx, error_handler, Some(err.into_spanned(*span)));
+                    prepare_error_handler(
+                        ctx,
+                        error_handler,
+                        Some(err.into_spanned(*span)),
+                        fancy_errors,
+                    );
                     pc = error_handler.handler_index;
                 } else {
                     // If not, exit the block with the error
@@ -246,6 +255,7 @@ fn prepare_error_handler(
     ctx: &mut EvalContext<'_>,
     error_handler: ErrorHandler,
     error: Option<Spanned<ShellError>>,
+    fancy_errors: bool,
 ) {
     if let Some(reg_id) = error_handler.error_register {
         if let Some(error) = error {
@@ -254,7 +264,10 @@ fn prepare_error_handler(
             // Create the error value and put it in the register
             ctx.put_reg(
                 reg_id,
-                error.item.into_value(error.span).into_pipeline_data(),
+                error
+                    .item
+                    .into_value(error.span, fancy_errors)
+                    .into_pipeline_data(),
             );
         } else {
             // Set the register to empty