migrator: Add migration for settings changed prior to migrator-introduction (#27375)

This PR updates two existing settings to use the settings migrator
instead of a manually implemented visitor. Both of these settings were
changed prior to the introduction of automatic migrations and the
visitor ensured that the settings were kept backwards compatible. See
https://github.com/zed-industries/zed/pull/22200 and
https://github.com/zed-industries/zed/pull/22364 respectively.

WIth this change, existing user configurations are updated accordingly
and the corresponding settings can derive `Deserialize` again.

I also added tests for the replacement of settings values, as there was
no test for this behaviour. Additionally, I added a seperate test for
the existing migration of `always_show_close_button`, since that
migration updated both the key and value.

Release Notes:

- N/A

crates/migrator/src/migrations.rs

@@ -1,3 +1,9 @@
+pub(crate) mod m_2025_01_02 {
+    mod settings;
+
+    pub(crate) use settings::SETTINGS_PATTERNS;
+}
+
 pub(crate) mod m_2025_01_29 {
     mod keymap;
     mod settings;