Hardcode normalized_os as iOS in event_aggregates (#5725)

sql/moz-fx-data-shared-prod/contextual_services_derived/event_aggregates_suggest_v1/query.sql

@@ -134,7 +134,9 @@ combined AS (
     'phone' AS form_factor,
     normalized_country_code AS country,
     metrics.string.fx_suggest_advertiser AS advertiser,
-    SPLIT(metadata.user_agent.os, ' ')[SAFE_OFFSET(0)] AS normalized_os,
+    -- This is now hardcoded, we can use the derived `normalized_os` once
+    -- https://bugzilla.mozilla.org/show_bug.cgi?id=1773722 is fixed
+    'iOS' AS normalized_os,
     client_info.app_channel AS release_channel,
     metrics.quantity.fx_suggest_position AS position,
     -- Only remote settings is in use on mobile

sql/moz-fx-data-shared-prod/contextual_services_derived/event_aggregates_v1/query.sql

@@ -158,7 +158,9 @@ combined AS (
     'remote settings' AS provider,
     -- Only standard suggestions are in use on mobile
     'firefox-suggest' AS match_type,
-    SPLIT(metadata.user_agent.os, ' ')[SAFE_OFFSET(0)] AS normalized_os,
+    -- This is now hardcoded, we can use the derived `normalized_os` once
+    -- https://bugzilla.mozilla.org/show_bug.cgi?id=1773722 is fixed
+    'iOS' AS normalized_os,
     -- This is the opt-in for Merino, not in use on mobile
     CAST(NULL AS BOOLEAN) AS suggest_data_sharing_enabled,
     blocks.query_type,

tests/sql/moz-fx-data-shared-prod/contextual_services_derived/event_aggregates_v1/test_aggregation/moz-fx-data-shared-prod.firefox_ios.fx_suggest.yaml

@@ -12,8 +12,6 @@
   metadata:
     geo:
       subdivision1: DC
-    user_agent:
-      os: iOS 17
   client_info:
     app_channel: release
   normalized_country_code: US

tests/sql/moz-fx-data-shared-prod/contextual_services_derived/event_aggregates_v1/test_overactive_filter/moz-fx-data-shared-prod.firefox_ios.fx_suggest.yaml

@@ -13,8 +13,6 @@
   metadata:
     geo:
       subdivision1: DC
-    user_agent:
-      os: iOS 17
   client_info:
     app_channel: release
   normalized_country_code: US