[SettingAction] Consolidate se23 logic and styles (#10131)

### WHY are these changes introduced?

Fixes #9964

### WHAT is this pull request doing?

Consolidate se23 logic and styles for `SettingAction` Component

### How to 🎩
Compare production and this PR's chromatic storybook to make sure styles
are the same


[Production](https://storybook.polaris.shopify.com/?path=/story/all-components-settingtoggle--with-deprecated-component&globals=polarisSummerEditions2023:true)
[This
PR](https://5d559397bae39100201eedc1-iqwftdxoka.chromatic.com/?path=/story/all-components-settingtoggle--with-deprecated-component)

polaris-react/src/components/SettingAction/SettingAction.scss

@@ -24,9 +24,7 @@ $feature-width: 350px;
 }
 
 .Action {
-  #{$se23} & {
-    @media #{$p-breakpoints-md-up} {
-      margin-top: var(--p-space-6);
-    }
+  @media #{$p-breakpoints-md-up} {
+    margin-top: var(--p-space-6);
   }
 }