agent: Use current shell (#28470)

Release Notes:

- agent: Replace `bash` tool with `terminal` tool which uses the current
shell

---------

Co-authored-by: Bennet <bennet@zed.dev>
Co-authored-by: Antonio <antonio@zed.dev>

crates/migrator/src/patterns.rs

@@ -7,5 +7,6 @@ pub(crate) use keymap::{
 };
 
 pub(crate) use settings::{
-    SETTINGS_LANGUAGES_PATTERN, SETTINGS_NESTED_KEY_VALUE_PATTERN, SETTINGS_ROOT_KEY_VALUE_PATTERN,
+    SETTINGS_ASSISTANT_TOOLS_PATTERN, SETTINGS_LANGUAGES_PATTERN,
+    SETTINGS_NESTED_KEY_VALUE_PATTERN, SETTINGS_ROOT_KEY_VALUE_PATTERN,
 };