[MM-56904] Reduce the number of api requests made to fetch user information for GMs on page load (#27149)

* use new endpoint to fetch group members

server/channels/store/sqlstore/preference_store.go

@@ -315,3 +315,54 @@ func (s SqlPreferenceStore) CleanupFlagsBatch(limit int64) (int64, error) {
 
 	return rowsAffected, nil
 }
+
+// Delete preference for limit_visible_dms_gms where their value is greater than "40" or less than "1"
+func (s SqlPreferenceStore) DeleteInvalidVisibleDmsGms() (int64, error) {
+	var queryString string
+	var args []interface{}
+	var err error
+
+	// We need to pad the value field with zeros when doing comparison's because the value is stored as a string.
+	// Having them the same length allows Postgres/MySQL to compare them correctly.
+	whereClause := sq.And{
+		sq.Eq{"Category": model.PreferenceCategorySidebarSettings},
+		sq.Eq{"Name": model.PreferenceLimitVisibleDmsGms},
+		sq.Or{
+			sq.Gt{"SUBSTRING(CONCAT('000000000000000', Value), LENGTH(Value) + 1, 15)": "000000000000040"},
+			sq.Lt{"SUBSTRING(CONCAT('000000000000000', Value), LENGTH(Value) + 1, 15)": "000000000000001"},
+		},
+	}
+	if s.DriverName() == "postgres" {
+		subQuery := s.getQueryBuilder().
+			Select("UserId, Category, Name").
+			From("Preferences").
+			Where(whereClause).
+			Limit(100)
+		queryString, args, err = s.getQueryBuilder().
+			Delete("Preferences").
+			Where(sq.Expr("(userid, category, name) IN (?)", subQuery)).
+			ToSql()
+		if err != nil {
+			return int64(0), errors.Wrap(err, "could not build sql query to delete preference")
+		}
+	} else {
+		queryString, args, err = s.getQueryBuilder().
+			Delete("Preferences").
+			Where(whereClause).
+			Limit(100).
+			ToSql()
+		if err != nil {
+			return int64(0), errors.Wrap(err, "could not build sql query to delete preference")
+		}
+	}
+
+	result, err := s.GetMasterX().Exec(queryString, args...)
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to delete Preference")
+	}
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		return 0, errors.Wrap(err, "unable to get rows affected")
+	}
+	return rowsAffected, nil
+}

server/channels/store/sqlstore/preference_store_test.go

@@ -15,7 +15,7 @@ import (
 )
 
 func TestPreferenceStore(t *testing.T) {
-	StoreTest(t, storetest.TestPreferenceStore)
+	StoreTestWithSqlStore(t, storetest.TestPreferenceStore)
 }
 
 func TestDeleteUnusedFeatures(t *testing.T) {