Optimize checkout (Azure#4982)

* Explicit checkout on build step to test.

* Adding checkout steps to test and analyze.

eng/pipelines/templates/jobs/archetype-sdk-client.yml

@@ -56,6 +56,9 @@ jobs:
           JavaVersion: '1.11'
 
     steps:
+      - checkout: self
+        fetchDepth: 1
+
       - script: |
           echo "##vso[build.addbuildtag]Scheduled"
         displayName: 'Tag scheduled builds'
@@ -87,6 +90,9 @@ jobs:
       vmImage: 'ubuntu-16.04'
 
     steps:
+      - checkout: self
+        fetchDepth: 1
+
       - task: UsePythonVersion@0
         displayName: 'Use Python 3.6'
         inputs:
@@ -222,6 +228,9 @@ jobs:
       vmImage: $(OSVmImage)
 
     steps:
+      - checkout: self
+        fetchDepth: 1
+
       - template: ../steps/verify-agent-os.yml
         parameters:
           OSName: $(OSName)