fix(ui): inconsistent pill sizes across admin panel (#12788)

### What?
Fixes inconsistent `pill` sizes across the Admin Panel.

### How?
Pills without a specified size default to **medium**. In the folders
[PR](https://github.com/payloadcms/payload/pull/10030), additional
padding was to the medium size. As a result, any pills without an
explicit size now appear larger than intended.

This PR fixes that by updating any pills that should be small to
explicitly set `size="small"`.

Fixes #12752

packages/plugin-search/src/Search/ui/ReindexButton/ReindexButtonLabel/index.tsx

@@ -5,7 +5,7 @@ export const ReindexButtonLabel = () => {
     i18n: { t },
   } = useTranslation()
   return (
-    <Pill className="pill--has-action" icon={<ChevronIcon />} pillStyle="light">
+    <Pill className="pill--has-action" icon={<ChevronIcon />} pillStyle="light" size="small">
       {t('general:reindex')}
     </Pill>
   )