Engineering - Pin macOS build agent (microsoft#164455)

Pin macOS build agent

Author: lszomoru

build/azure-pipelines/product-build-pr.yml

@@ -109,7 +109,7 @@ jobs:
   # - job: macOSUnitTest
   #   displayName: macOS (Unit Tests)
   #   pool:
-  #     vmImage: macOS-latest
+  #     vmImage: macOS-11
   #   timeoutInMinutes: 60
   #   variables:
   #     BUILDSECMON_OPT_IN: true
@@ -125,7 +125,7 @@ jobs:
   # - job: macOSIntegrationTest
   #   displayName: macOS (Integration Tests)
   #   pool:
-  #     vmImage: macOS-latest
+  #     vmImage: macOS-11
   #   timeoutInMinutes: 60
   #   variables:
   #     BUILDSECMON_OPT_IN: true
@@ -141,7 +141,7 @@ jobs:
   # - job: macOSSmokeTest
   #   displayName: macOS (Smoke Tests)
   #   pool:
-  #     vmImage: macOS-latest
+  #     vmImage: macOS-11
   #   timeoutInMinutes: 60
   #   variables:
   #     BUILDSECMON_OPT_IN: true

build/azure-pipelines/product-build.yml

@@ -213,7 +213,7 @@ stages:
         - ${{ if eq(variables.VSCODE_BUILD_STAGE_MACOS, true) }}:
           - job: MacOS
             pool:
-              vmImage: macOS-latest
+              vmImage: macOS-11
             steps:
               - template: ./darwin/cli-build-darwin.yml
                 parameters:
@@ -526,7 +526,7 @@ stages:
           - ${{ if eq(parameters.VSCODE_BUILD_TUNNEL_CLI, true) }}:
             - CompileCLI
         pool:
-          vmImage: macOS-latest
+          vmImage: macOS-11
         variables:
           BUILDSECMON_OPT_IN: true
         jobs: