Improve tracker source and first-party cleanup

Surface every CookieSource value in the console: the trackers page
filter was missing the HTTP option and the source badge helper had no
EXTENSION case, so HTTP-sourced rows could not be filtered and
extension-sourced rows rendered the raw enum string.

On the backend, the mark-first-party verdict now blanks the stale
description on both the catalog row and its uncategorised org tracker
patterns. A terminal non-third-party row keeps no vendor link, so a
description naming the (now-cleared) vendor would be misleading; the
mapping worker only copies descriptions into empty rows and never
clears them, so clearing is done explicitly here.

Signed-off-by: Émile Ré <emile@probo.com>

apps/console/src/pages/organizations/cookie-banners/configuration/trackers/CookieBannerTrackersPage.tsx

@@ -244,6 +244,7 @@ export default function CookieBannerTrackersPage({
           <Option value="ALL">{__("All sources")}</Option>
           <Option value="SCRIPT">{__("Script")}</Option>
           <Option value="PRE_EXISTING">{__("Pre-existing")}</Option>
+          <Option value="HTTP">{__("HTTP")}</Option>
           <Option value="EXTENSION">{__("Extension")}</Option>
         </Select>
         <Select