Directly include Settings struct for the server (#16042)

## Summary

This PR refactors the `RuffSettings` struct to directly include the
resolved `Settings` instead of including the specific fields from it.
The server utilizes a lot of it already, so it makes sense to just
include the entire struct for simplicity.

### `Deref`

I implemented `Deref` on `RuffSettings` to return the `Settings` because
`RuffSettings` is now basically a wrapper around it with the config path
as the other field. This path field is only used for debugging
("printDebugInformation" command).

crates/ruff_server/src/lint.rs

@@ -67,16 +67,15 @@ pub(crate) fn check(
     show_syntax_errors: bool,
 ) -> DiagnosticsMap {
     let source_kind = query.make_source_kind();
-    let file_resolver_settings = query.settings().file_resolver();
-    let linter_settings = query.settings().linter();
+    let settings = query.settings();
     let document_path = query.file_path();
 
     // If the document is excluded, return an empty list of diagnostics.
     let package = if let Some(document_path) = document_path.as_ref() {
         if is_document_excluded_for_linting(
             document_path,
-            file_resolver_settings,
-            linter_settings,
+            &settings.file_resolver,
+            &settings.linter,
             query.text_document_language_id(),
         ) {
             return DiagnosticsMap::default();
@@ -86,7 +85,7 @@ pub(crate) fn check(
             document_path
                 .parent()
                 .expect("a path to a document should have a parent path"),
-            &linter_settings.namespace_packages,
+            &settings.linter.namespace_packages,
         )
         .map(PackageRoot::root)
     } else {
@@ -118,7 +117,7 @@ pub(crate) fn check(
         &stylist,
         &indexer,
         &directives,
-        linter_settings,
+        &settings.linter,
         flags::Noqa::Enabled,
         &source_kind,
         source_type,
@@ -130,7 +129,7 @@ pub(crate) fn check(
         &diagnostics,
         &locator,
         indexer.comment_ranges(),
-        &linter_settings.external,
+        &settings.linter.external,
         &directives.noqa_line_for,
         stylist.line_ending(),
     );