Revert deprecate code actions on format (#40409)

Closes #40334

This reverts the change made in #39983, and includes a replacement
migration that will transform formatter settings values consisting of
only `code_action` format steps into the previously deprecated
`code_actions_on_format` in an attempt to restore the behavior to what
it was before the migration that deprecated `code_actions_on_format`.

This PR will result in a modified order in the `code_actions_on_format`
setting if it existed, however the decision was made to explicitly
ignore this for now, as this PR is primarily targeting users who have
already had the deprecation migration run, and no longer have the
`code_actions_on_format` key

Release Notes:

- Fixed an issue with a settings migration that deprecated the
`code_actions_on_format` setting. The `code_actions_on_format` setting
has been un-deprecated, and affected users will have the bad migration
rolled back with an updated migration

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>
Co-authored-by: HactarCE <6060305+HactarCE@users.noreply.github.com>

crates/settings/src/settings_content/language.rs

@@ -318,6 +318,11 @@ pub struct LanguageSettingsContent {
     ///
     /// Default: true
     pub use_on_type_format: Option<bool>,
+    /// Which code actions to run on save after the formatter.
+    /// These are not run if formatting is off.
+    ///
+    /// Default: {} (or {"source.organizeImports": true} for Go).
+    pub code_actions_on_format: Option<HashMap<String, bool>>,
     /// Whether to perform linked edits of associated ranges, if the language server supports it.
     /// For example, when editing opening <html> tag, the contents of the closing </html> tag will be edited as well.
     ///