Add date-based condition to Azure SQL jobs to run every 16 days

Author: gargsaumya

eng/pipelines/pr-validation-pipeline.yml

@@ -1963,7 +1963,7 @@ jobs:
 
 - job: PytestOnWindows_AzureSQL
   displayName: 'Windows x64 AzureSQL'
-  condition: eq(variables['ENABLE_AZURE_SQL'], 'true')
+  condition: or(eq(variables['ENABLE_AZURE_SQL'], 'true'), eq(mod(int(format('{0:dd}', pipeline.startTime)), 16), 0))
   pool:
     vmImage: 'windows-latest'
 
@@ -1999,7 +1999,7 @@ jobs:
 
 - job: PytestOnMacOS_AzureSQL
   displayName: 'macOS x86_64 AzureSQL'
-  condition: eq(variables['ENABLE_AZURE_SQL'], 'true')
+  condition: or(eq(variables['ENABLE_AZURE_SQL'], 'true'), eq(mod(int(format('{0:dd}', pipeline.startTime)), 16), 0))
   pool:
     vmImage: 'macos-latest'
 
@@ -2040,7 +2040,7 @@ jobs:
 
 - job: PytestOnLinux_AzureSQL
   displayName: 'Linux x86_64 AzureSQL'
-  condition: eq(variables['ENABLE_AZURE_SQL'], 'true')
+  condition: or(eq(variables['ENABLE_AZURE_SQL'], 'true'), eq(mod(int(format('{0:dd}', pipeline.startTime)), 16), 0))
   pool:
     vmImage: 'ubuntu-latest'