settings_ui: Show migration banner (#41112)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Danilo <danilo@zed.dev>

crates/migrator/src/migrator.rs

@@ -15,6 +15,7 @@
 //! You only need to write replacement logic for x-1 to x because you can be certain that, internally, every user will be at x-1, regardless of their on disk state.
 
 use anyhow::{Context as _, Result};
+use settings_json::{infer_json_indent_size, parse_json_with_comments, update_value_in_json_text};
 use std::{cmp::Reverse, ops::Range, sync::LazyLock};
 use streaming_iterator::StreamingIterator;
 use tree_sitter::{Query, QueryMatch};
@@ -74,7 +75,7 @@ fn run_migrations(text: &str, migrations: &[MigrationType]) -> Result<Option<Str
 
     let mut current_text = text.to_string();
     let mut result: Option<String> = None;
-    let json_indent_size = settings::infer_json_indent_size(&current_text);
+    let json_indent_size = infer_json_indent_size(&current_text);
     for migration in migrations.iter() {
         let migrated_text = match migration {
             MigrationType::TreeSitter(patterns, query) => migrate(&current_text, patterns, query)?,
@@ -83,14 +84,14 @@ fn run_migrations(text: &str, migrations: &[MigrationType]) -> Result<Option<Str
                     return Ok(None);
                 }
                 let old_content: serde_json_lenient::Value =
-                    settings::parse_json_with_comments(&current_text)?;
+                    parse_json_with_comments(&current_text)?;
                 let old_value = serde_json::to_value(&old_content).unwrap();
                 let mut new_value = old_value.clone();
                 callback(&mut new_value)?;
                 if new_value != old_value {
                     let mut current = current_text.clone();
                     let mut edits = vec![];
-                    settings::update_value_in_json_text(
+                    update_value_in_json_text(
                         &mut current,
                         &mut vec![],
                         json_indent_size,