Remove extra git submodule commands

- all work now done in "Checkout dotnet/aspnetcore" step
- reconfigured pipeline based on #22002 (comment)

Author: dougbu

.azure/pipelines/devBuilds.yml

@@ -29,8 +29,6 @@ stages:
       jobDisplayName: "Build: Components"
       agentOs: Windows
       steps:
-      - script: git submodule init
-      - script: git submodule update --recursive
       - script: ./build.cmd
                 -ci
                 -arch x64
@@ -54,8 +52,6 @@ stages:
       jobDisplayName: "Build: Servers"
       agentOs: Windows
       steps:
-      - script: git submodule init
-      - script: git submodule update --recursive
       - script: ./build.cmd
                 -ci
                 -arch x64
@@ -79,8 +75,6 @@ stages:
       jobDisplayName: "Build: Project Templates"
       agentOs: Windows
       steps:
-      - script: git submodule init
-      - script: git submodule update --recursive
       - script: ./build.cmd
                 -ci
                 -arch x64
@@ -104,8 +98,6 @@ stages:
       jobDisplayName: "Build: Everything"
       agentOs: Windows
       steps:
-      - script: git submodule init
-      - script: git submodule update --recursive
       - script: ./build.cmd
                 -ci
                 -arch x64