[0.81] Fix symbol publishing auth by using System.AccessToken (#15651)

* Fix symbol publishing auth by using System.AccessToken

* Disable publish symbols to unblock build

Author: acoates-ms

.ado/publish.yml

@@ -380,11 +380,13 @@ extends:
             # Make symbols available through http://symweb.
             - task: PublishSymbols@2
               displayName: Publish symbols
+              enabled: false
               env:
                 ARTIFACTSERVICES_SYMBOL_ACCOUNTNAME: microsoft
               inputs:
                 SearchPattern: vnext/target/**/*.pdb
                 SymbolServerType: TeamServices
+                Pat: $(System.AccessToken)
 
             templateContext:
               sdl:
@@ -479,6 +481,7 @@ extends:
           # Symbol Publishing for Work Item 59264834 - MSRC Compliance
           - task: PublishSymbols@2
             displayName: 'Publish Symbols to Microsoft Symbol Server'
+            enabled: false
             condition: and(succeeded(), in(variables['Build.Reason'], 'IndividualCI', 'BatchedCI'))
             env:
               ARTIFACTSERVICES_SYMBOL_ACCOUNTNAME: microsoft
@@ -491,6 +494,7 @@ extends:
               SymbolsArtifactName: 'ReactNativeWindows-Symbols'
               DetailedLog: true
               TreatNotIndexedAsWarning: false
+              Pat: $(System.AccessToken)
 
           templateContext:
             sdl: