Update PublishData.json for telmet branch (#76539)

* Update PublishData.json for telmet branch

Author: phil-allen-msft

eng/config/PublishData.json

@@ -215,6 +215,15 @@
       "vsMajorVersion": 17,
       "insertionTitlePrefix": "[d17.12]"
     },
+    "release/dev17.12-telmet": {
+      "nugetKind": [
+        "Shipping",
+        "NonShipping"
+      ],
+      "vsBranch": "rel/d17.12telmet",
+      "vsMajorVersion": 17,
+      "insertionTitlePrefix": "[d17.12]"
+    },
     "release/dev17.13": {
       "nugetKind": [
         "Shipping",