DENG-4631 - add profile_group_id to metrics_clients_last_seen_v1 (#6117)

* DENG-4631 - add profile_group_id to metrics_clients_last_seen_v1

* DENG-4631 add schema.yaml

sql/moz-fx-data-shared-prod/firefox_desktop_derived/metrics_clients_last_seen_v1/schema.yaml

@@ -0,0 +1,22 @@
+fields:
+- name: submission_date
+  type: DATE
+  mode: NULLABLE
+- name: client_id
+  type: STRING
+  mode: NULLABLE
+- name: sample_id
+  type: INTEGER
+  mode: NULLABLE
+- name: normalized_channel
+  type: STRING
+  mode: NULLABLE
+- name: n_metrics_ping
+  type: INTEGER
+  mode: NULLABLE
+- name: days_sent_metrics_ping_bits
+  type: INTEGER
+  mode: NULLABLE
+- name: profile_group_id
+  type: STRING
+  mode: NULLABLE

sql_generators/glean_usage/templates/metrics_clients_last_seen.query.sql

@@ -35,6 +35,9 @@ SELECT
     {% endif %}
   {% endfor -%}
   {% endif -%}
+  {% if app_name == "firefox_desktop" -%}
+    _current.profile_group_id,
+  {% endif -%}
 FROM
   _previous
 FULL JOIN