Refactor markdown formatting utilities to avoid building intermediate strings (#29511)

These were nearly always used when using `format!` / `write!` etc, so it
makes sense to not have an intermediate `String`.

Release Notes:

- N/A

crates/assistant_tools/src/move_path_tool.rs

@@ -8,7 +8,7 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::{path::Path, sync::Arc};
 use ui::IconName;
-use util::markdown::MarkdownString;
+use util::markdown::MarkdownInlineCode;
 
 #[derive(Debug, Serialize, Deserialize, JsonSchema)]
 pub struct MovePathToolInput {
@@ -61,8 +61,8 @@ impl Tool for MovePathTool {
     fn ui_text(&self, input: &serde_json::Value) -> String {
         match serde_json::from_value::<MovePathToolInput>(input.clone()) {
             Ok(input) => {
-                let src = MarkdownString::inline_code(&input.source_path);
-                let dest = MarkdownString::inline_code(&input.destination_path);
+                let src = MarkdownInlineCode(&input.source_path);
+                let dest = MarkdownInlineCode(&input.destination_path);
                 let src_path = Path::new(&input.source_path);
                 let dest_path = Path::new(&input.destination_path);
 
@@ -71,7 +71,7 @@ impl Tool for MovePathTool {
                     .and_then(|os_str| os_str.to_os_string().into_string().ok())
                 {
                     Some(filename) if src_path.parent() == dest_path.parent() => {
-                        let filename = MarkdownString::inline_code(&filename);
+                        let filename = MarkdownInlineCode(&filename);
                         format!("Rename {src} to {filename}")
                     }
                     _ => {