Devops Scheduled Test Triggers: Enable for master branch (Azure#5366)

* scheduled triggers for master branch

builds/e2e/connectivity.yaml

@@ -1,6 +1,16 @@
 trigger: none
 pr: none
 
+# Test schedule the same between master and release/1.2, but offset 12 hours. 
+# Don't run any scheduled tests on Sunday, as release/1.1 runs its scheduled tests then.
+schedules:
+- cron: "0 0 * * 1,2,3,4,5,6"
+  displayName: Daily midnight build
+  branches:
+    include:
+    - master
+  always: true
+
 variables:
   NugetSecurityAnalysisWarningLevel: warn
   images.artifact.name.linux: 'core-linux'

builds/e2e/nested-connectivity.yaml

@@ -1,6 +1,19 @@
 trigger: none
 pr: none
 
+# Nested E2E and Nested Connectivity share test agents.
+# Thus the schedules between these pipelines are offset by 6 hours.
+# This will ensure that enough agents are avaiable to service all tests.
+# 
+# Test schedule the same between master and release/1.2, but offset 12 hours. 
+schedules:
+- cron: "0 0 * * *"
+  displayName: Daily midnight build
+  branches:
+    include:
+    - master
+  always: true
+
 variables:
   NugetSecurityAnalysisWarningLevel: warn
 

builds/e2e/nested-e2e.yaml

@@ -1,6 +1,19 @@
 trigger: none
 pr: none
 
+# Nested E2E and Nested Connectivity share test agents.
+# Thus the schedules between these pipelines are offset by 6 hours.
+# This will ensure that enough agents are avaiable to service all tests.
+#
+# Test schedule the same between master and release/1.2, but offset 12 hours. 
+schedules:
+- cron: "0 6 * * *"
+  displayName: Daily morning build
+  branches:
+    include:
+    - master
+  always: true
+
 variables:
   # A 'minimal' pipeline only runs one end-to-end test (TempSensor). This is useful for platforms or
   # environments that are very similar to other platforms/environments in our matrix, Ubuntu 18.04