Updating J2C+ qos_yaml for 400G_2k profile (#15648)

* [Qos]400G_2k profile added to qos_yaml

* [Qos]qos_yaml_lossy_400G_2k

When initially 400G & 100G profiles were added with cable length 12km & 2km, 400G_2km profile was skipped due to no visibility of adding 400G line card to downstream network for t2 topology.
Adding it back again, so that it can be used in future, if 400G line cards used as leafrouters

tests/qos/files/qos_params.j2c.yaml

@@ -427,6 +427,113 @@ qos_params:
                     pkts_num_trig_egr_drp: 2396745
                     pkts_num_fill_egr_min: 0
                     cell_size: 4096
+            400000_2000m:
+                pkts_num_leak_out: 140
+                internal_hdr_size: 48
+                xoff_1:
+                    dscp: 3
+                    ecn: 1
+                    pg: 3
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_trig_ingr_drp: 670430
+                    pkts_num_margin: 100
+                xoff_2:
+                    dscp: 4
+                    ecn: 1
+                    pg: 4
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_trig_ingr_drp: 670430
+                    pkts_num_margin: 100
+                hdrm_pool_size:
+                    dscps: [ 3, 4 ]
+                    ecn: 1
+                    pgs: [ 3, 4 ]
+                    src_port_ids: [ 0, 2, 4, 6, 8, 10, 12, 14, 16 ]
+                    dst_port_id: 18
+                    pgs_num: 18
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_hdrm_full: 622850
+                    pkts_num_hdrm_partial: 622750
+                    margin: 300
+                wm_pg_headroom:
+                    dscp: 3
+                    ecn: 1
+                    pg: 3
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_trig_ingr_drp: 670430
+                    cell_size: 4096
+                    pkts_num_margin: 30
+                xon_1:
+                    dscp: 3
+                    ecn: 1
+                    pg: 3
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_dismiss_pfc: 12985
+                    pkts_num_margin: 150
+                xon_2:
+                    dscp: 4
+                    ecn: 1
+                    pg: 4
+                    pkts_num_trig_pfc: 657523
+                    pkts_num_dismiss_pfc: 12985
+                    pkts_num_margin: 150
+                lossy_queue_1:
+                    dscp: 8
+                    ecn: 1
+                    pg: 0
+                    pkts_num_trig_egr_drp: 2179770
+                    pkts_num_margin: 100
+                wm_pg_shared_lossless:
+                    dscp: 3
+                    ecn: 1
+                    pg: 3
+                    pkts_num_fill_min: 0
+                    pkts_num_trig_pfc: 657523
+                    packet_size: 64
+                    cell_size: 4096
+                    pkts_num_margin: 40
+                wm_pg_shared_lossy:
+                    dscp: 8
+                    ecn: 1
+                    pg: 0
+                    pkts_num_fill_min: 0
+                    pkts_num_trig_egr_drp: 2179770
+                    packet_size: 64
+                    cell_size: 4096
+                    pkts_num_margin: 40
+                wm_q_shared_lossless:
+                    dscp: 3
+                    ecn: 1
+                    queue: 3
+                    pkts_num_fill_min: 0
+                    pkts_num_trig_ingr_drp: 670430
+                    cell_size: 4096
+                wm_buf_pool_lossless:
+                    dscp: 3
+                    ecn: 1
+                    pg: 3
+                    queue: 3
+                    pkts_num_fill_ingr_min: 0
+                    pkts_num_trig_pfc: 28160
+                    pkts_num_trig_ingr_drp: 750848
+                    pkts_num_fill_egr_min: 8
+                    cell_size: 4096
+                wm_q_shared_lossy:
+                    dscp: 8
+                    ecn: 1
+                    queue: 0
+                    pkts_num_fill_min: 0
+                    pkts_num_trig_egr_drp: 2179770
+                    cell_size: 4096
+                wm_buf_pool_lossy:
+                    dscp: 8
+                    ecn: 1
+                    pg: 0
+                    queue: 0
+                    pkts_num_fill_ingr_min: 0
+                    pkts_num_trig_egr_drp: 2396745
+                    pkts_num_fill_egr_min: 0
+                    cell_size: 4096
             400000_120000m:
                 pkts_num_leak_out: 140
                 internal_hdr_size: 48