Map TC6 to Queue 1 for regular traffic (#11904)

Why I did it
This PR is to update TC_TO_QUEUE_MAP|AZURE for SKU Arista-7050CX3-32S-D48C8 and Arista-7260CX3 T0.

The change is only to align the TC_TO_QUEUE_MAP for regular traffic and bounced traffic. It has no impact on business because we have no traffic being mapped to TC2 or TC6.

How I did it
Update TC_TO_QUEUE_MAP|AZURE , and test cases as well.

How to verify it
Verified by running test case test_j2files.py

/sonic/src/sonic-config-engine$ python3 setup.py test -s tests/test_j2files.py
running test
......
----------------------------------------------------------------------
Ran 29 tests in 25.390s

OK

device/arista/x86_64-arista_7050cx3_32s/Arista-7050CX3-32S-D48C8/qos.json.j2

@@ -170,7 +170,7 @@
             "3": "3",
             "4": "4",
             "5": "5",
-            "6": "6",
+            "6": "1",
             "7": "7",
             "8": "1"
         },

device/common/profiles/th2/7260/BALANCED/qos.json.j2

@@ -322,7 +322,7 @@
             "3": "3",
             "4": "4",
             "5": "5",
-            "6": "6",
+            "6": "1",
             "7": "7",
             "8": "1"
         },

device/common/profiles/th2/7260/RDMA-CENTRIC/qos.json.j2

@@ -321,7 +321,7 @@
             "3": "3",
             "4": "4",
             "5": "5",
-            "6": "6",
+            "6": "1",
             "7": "7",
             "8": "1"
         },

src/sonic-config-engine/tests/sample_output/py3/qos-arista7050cx3-dualtor.json

@@ -19,7 +19,7 @@
             "3": "3",
             "4": "4",
             "5": "5",
-            "6": "6",
+            "6": "1",
             "7": "7",
             "8": "1"
         },

src/sonic-config-engine/tests/sample_output/py3/qos-arista7260-dualtor.json

@@ -19,7 +19,7 @@
             "3": "3",
             "4": "4",
             "5": "5",
-            "6": "6",
+            "6": "1",
             "7": "7",
             "8": "1"
         },