Cherry-Pick on PublishSymbols Task: Make SymbolServerType to be explicitly selected (#5204) (#5206)

Make SymbolServerType to be explicitly selected to handle on-prem scenario

Author: arunkm

Tasks/PublishSymbols/Strings/resources.resjson/en-US/resources.resjson

@@ -13,7 +13,7 @@
   "loc.input.label.PublishSymbols": "Publish symbols",
   "loc.input.help.PublishSymbols": "Indicates whether to publish the symbol files.",
   "loc.input.label.SymbolServerType": "Symbol Server Type",
-  "loc.input.help.SymbolServerType": "Choose where to publish symbols. The \"Team Services\" option is under private preview. Follow [these instructions](https://go.microsoft.com/fwlink/?linkid=846265) to participate in the private preview.",
+  "loc.input.help.SymbolServerType": "Choose where to publish symbols. The \"Team Services\" option is under private preview. Team Foundation Server only supports the \"File share\" option. Follow [these instructions](https://go.microsoft.com/fwlink/?linkid=846265) to participate in the private preview.",
   "loc.input.label.SymbolsPath": "Path to publish symbols",
   "loc.input.help.SymbolsPath": "Path to publish symbols.",
   "loc.input.label.DetailedLog": "Verbose logging",

Tasks/PublishSymbols/task.json

@@ -61,10 +61,11 @@
             "type": "pickList",
             "label": "Symbol Server Type",
             "required": true,
-            "defaultValue": "TeamServices",
-            "helpMarkDown": "Choose where to publish symbols. The \"Team Services\" option is under private preview. Follow [these instructions](https://go.microsoft.com/fwlink/?linkid=846265) to participate in the private preview.",
+            "defaultValue": " ",
+            "helpMarkDown": "Choose where to publish symbols. The \"Team Services\" option is under private preview. Team Foundation Server only supports the \"File share\" option. Follow [these instructions](https://go.microsoft.com/fwlink/?linkid=846265) to participate in the private preview.",
             "options":
             {
+                " ": "Select one",
                 "TeamServices": "Team Services",
                 "FileShare": "File share"
             },

Tasks/PublishSymbols/task.loc.json

@@ -61,9 +61,10 @@
       "type": "pickList",
       "label": "ms-resource:loc.input.label.SymbolServerType",
       "required": true,
-      "defaultValue": "TeamServices",
+      "defaultValue": " ",
       "helpMarkDown": "ms-resource:loc.input.help.SymbolServerType",
       "options": {
+        " ": "Select one",
         "TeamServices": "Team Services",
         "FileShare": "File share"
       },