MM-45899: Insights: least active channels (#20796)

* Add api endpoints, app layers for top inactive channels with dummy store calls

* Add store functions for top inactive channels

* Add model, store, app tests.

* Add client function and api tests

* Add participants information to TopInactiveChannel

* Translation fix

* Style fix while writing response

* Return channelmember IDs instead of profiles, query in batch avoiding inside the loop

* Make the following changes

 - move DeleteAt to subqueries, to avoid select, group by
 - Remove TeamId from response
 - Count bots and webhook posts

* SQL query lint fix, store test fix to include bot messages

* make app-layers

* Fix empty participant lists being sent as [""]

* Track channel joins, to distinguish 0 activity channels vs new channels

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/retrylayer/retrylayer.go

@@ -2039,6 +2039,48 @@ func (s *RetryLayerChannelStore) GetTopChannelsForUserSince(userID string, teamI
 
 }
 
+func (s *RetryLayerChannelStore) GetTopInactiveChannelsForTeamSince(teamID string, userID string, since int64, offset int, limit int) (*model.TopInactiveChannelList, error) {
+
+	tries := 0
+	for {
+		result, err := s.ChannelStore.GetTopInactiveChannelsForTeamSince(teamID, userID, since, offset, limit)
+		if err == nil {
+			return result, nil
+		}
+		if !isRepeatableError(err) {
+			return result, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
+func (s *RetryLayerChannelStore) GetTopInactiveChannelsForUserSince(teamID string, userID string, since int64, offset int, limit int) (*model.TopInactiveChannelList, error) {
+
+	tries := 0
+	for {
+		result, err := s.ChannelStore.GetTopInactiveChannelsForUserSince(teamID, userID, since, offset, limit)
+		if err == nil {
+			return result, nil
+		}
+		if !isRepeatableError(err) {
+			return result, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerChannelStore) GroupSyncedChannelCount() (int64, error) {
 
 	tries := 0