Configuring network isolation for OneBranch pipelines. (microsoft#15017)

Co-authored-by: aaruag <[email protected]>
Co-authored-by: jslobodzian <[email protected]>

Author: 3 people

.pipelines/fasttrack/FasttrackMergeNotifier.yml

@@ -15,6 +15,8 @@ extends:
   template: v2/OneBranch.NonOfficial.CrossPlat.yml@templates
   parameters:
     featureFlags:
+      LinuxHostVersion:
+        Network: R1
       runOnHost: true
     globalSdl:
       credscan:

.pipelines/prchecks/PackageBuildPRCheck.yml

@@ -47,6 +47,9 @@ variables:
 extends:
   template: v2/OneBranch.NonOfficial.CrossPlat.yml@templates
   parameters:
+    featureFlags:
+      LinuxHostVersion:
+        Network: R1
     globalSdl:
       credscan:
         suppressionsFile: .config/CredScanSuppressions.json