FEATURE: Allow site settings to be edited throughout admin UI (#26154)

This commit makes it so the site settings filter controls and
the list of settings input editors themselves can be used elsewhere
in the admin UI outside of /admin/site_settings

This allows us to provide more targeted groups of settings in different
UI areas where it makes sense to provide them, such as on plugin pages.
You could open a single page for a plugin where you can see information
about that plugin, change settings, and configure it with custom UIs
in the one place.

In future we will do this in "config areas" for other parts of the
admin UI.

spec/models/site_setting_spec.rb

@@ -171,4 +171,29 @@ RSpec.describe SiteSetting do
 
     expect(settings.test_setting).to eq(value)
   end
+
+  describe "#all_settings" do
+    it "does not include the `default_locale` setting if include_locale_setting is false" do
+      expect(SiteSetting.all_settings.map { |s| s[:setting] }).to include("default_locale")
+      expect(
+        SiteSetting.all_settings(include_locale_setting: false).map { |s| s[:setting] },
+      ).not_to include("default_locale")
+    end
+
+    it "does not include the `default_locale` setting if filter_categories are specified" do
+      expect(
+        SiteSetting.all_settings(filter_categories: ["branding"]).map { |s| s[:setting] },
+      ).not_to include("default_locale")
+    end
+
+    it "does not include the `default_locale` setting if filter_plugin is specified" do
+      expect(
+        SiteSetting.all_settings(filter_plugin: "chat").map { |s| s[:setting] },
+      ).not_to include("default_locale")
+    end
+
+    it "includes only settings for the specified category" do
+      expect(SiteSetting.all_settings(filter_categories: ["required"]).count).to eq(12)
+    end
+  end
 end