[MM-43850] Separate leave_team events for associated user and team (#21231)

* Separate leave_team events for associated user and team

* Remove unnecessary change of sending mode

* Remove redundant get, set of message.broadcast

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

api4/team_test.go

@@ -2632,6 +2632,51 @@ func TestRemoveTeamMember(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestRemoveTeamMemberEvents(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	client1 := th.CreateClient()
+	th.LoginBasicWithClient(client1)
+	WebSocketClient, err := th.CreateWebSocketClientWithClient(client1)
+	require.NoError(t, err)
+	defer WebSocketClient.Close()
+	WebSocketClient.Listen()
+	resp := <-WebSocketClient.ResponseChannel
+	require.Equal(t, resp.Status, model.StatusOk)
+
+	client2 := th.CreateClient()
+	th.LoginBasic2WithClient(client2)
+	WebSocketClient2, err := th.CreateWebSocketClientWithClient(client2)
+	require.NoError(t, err)
+	defer WebSocketClient2.Close()
+	WebSocketClient2.Listen()
+	resp = <-WebSocketClient2.ResponseChannel
+	require.Equal(t, resp.Status, model.StatusOk)
+
+	th.TestForSystemAdminAndLocal(t, func(t *testing.T, client *model.Client4) {
+		// remove second user from basic team
+		_, err := client.RemoveTeamMember(th.BasicTeam.Id, th.BasicUser2.Id)
+		require.NoError(t, err)
+
+		assertExpectedWebsocketEvent(t, WebSocketClient, model.WebsocketEventLeaveTeam, func(event *model.WebSocketEvent) {
+			eventUserId, ok := event.GetData()["user_id"].(string)
+			require.True(t, ok, "expected user")
+			// assert eventUser.Id is same as th.BasicUser.Id
+			assert.Equal(t, eventUserId, th.BasicUser2.Id)
+			// assert this event doesn't go to event creator
+			assert.Equal(t, event.GetBroadcast().OmitUsers[eventUserId], true)
+		})
+		assertExpectedWebsocketEvent(t, WebSocketClient2, model.WebsocketEventLeaveTeam, func(event *model.WebSocketEvent) {
+			eventUserId, ok := event.GetData()["user_id"].(string)
+			require.True(t, ok, "expected user")
+			// assert eventUser.Id is same as th.BasicUser.Id
+			assert.Equal(t, eventUserId, th.BasicUser2.Id)
+		})
+	})
+
+}
+
 func TestGetTeamStats(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()