Replace explicit richCodeNavigationEnvironment in azure-pipelines-ric…

…hnav.yml

This is managed by the arcade defaults, we should be using the "internal" environment as requested by the RichNav team.

azure-pipelines-richnav.yml

@@ -14,7 +14,6 @@ stages:
       parameters:
         enableMicrobuild: true
         enableRichCodeNavigation: true
-        richCodeNavigationEnvironment: production
         helixRepo: dotnet/efcore
         jobs:
           - job: Windows
@@ -35,4 +34,4 @@ stages:
                 inputs:
                   filePath: $(Build.SourcesDirectory)\eng\common\build.ps1
                   arguments: -restore -build -ci
-                displayName: Build
+                displayName: Build