DENG-2938 Update product download logic to limit to Firefox Desktop downloads only in www_site_landing_page_metrics_v2 (#5158)

* DENG-2938 - update schema column descriptions for product download columns

* DENG-2938 - update product download logic to be firefox desktop only

* DENG-2938 add backticks around date

sql/moz-fx-data-marketing-prod/ga_derived/www_site_landing_page_metrics_v2/query.sql

@@ -23,29 +23,41 @@ SELECT
     IF(NOT `moz-fx-data-shared-prod.udf.ga_is_mozilla_browser`(browser), entrances, 0)
   ) AS non_fx_sessions,
   COUNTIF(
-    (date <= '2024-02-16' AND event_name = 'product_download')
-    OR (
-      date > '2024-02-16'
-      AND event_name IN (
-        'firefox_download',
-        'focus_download',
-        'klar_download',
-        'firefox_mobile_download'
+    (
+      `date` <= '2024-02-16'
+      AND event_name = 'product_download'
+      AND product_type = 'firefox'
+      AND platform_type IN (
+        'win',
+        'win64',
+        'macos',
+        'linux64',
+        'win64-msi',
+        'linux',
+        'win-msi',
+        'win64-aarch64'
       )
     )
+    OR (`date` > '2024-02-16' AND event_name = 'firefox_download')
   ) AS downloads,
   COUNTIF(
     (
-      (date <= '2024-02-16' AND event_name = 'product_download')
-      OR (
-        date > '2024-02-16'
-        AND event_name IN (
-          'firefox_download',
-          'focus_download',
-          'klar_download',
-          'firefox_mobile_download'
+      (
+        `date` <= '2024-02-16'
+        AND event_name = 'product_download'
+        AND product_type = 'firefox'
+        AND platform_type IN (
+          'win',
+          'win64',
+          'macos',
+          'linux64',
+          'win64-msi',
+          'linux',
+          'win-msi',
+          'win64-aarch64'
         )
       )
+      OR (`date` > '2024-02-16' AND event_name = 'firefox_download')
     )
     AND NOT `moz-fx-data-shared-prod.udf.ga_is_mozilla_browser`(browser)
   ) AS non_fx_downloads,

sql/moz-fx-data-marketing-prod/ga_derived/www_site_landing_page_metrics_v2/schema.yaml

@@ -86,11 +86,11 @@ fields:
 - mode: NULLABLE
   name: downloads
   type: INT64
-  description: Downloads - The number of product_download events
+  description: Downloads - The number of Firefox Desktop downloads
 - mode: NULLABLE
   name: non_fx_downloads
   type: INT64
-  description: Non Firefox Downloads - The number of product_download events on a non-Firefox browser
+  description: Non Firefox Downloads - The number of Firefox Desktop downloads from a non-Firefox browser
 - mode: NULLABLE
   name: pageviews
   type: INT64