Set Build Env variables to skip MSI E2E tests if needed (#5285)

Update template-build-and-run-all-tests.yaml

Author: gladjohn

build/template-build-and-run-all-tests.yaml

@@ -96,10 +96,11 @@ jobs: #Build and stage projects
   - template: template-test-on-linux.yaml
 
 - job: 'RunManagedIdentityE2ETestsOnAzureArc'
-  displayName: 'Managed Identity E2E Tests – Azure ARC Agent'
+  displayName: 'Managed Identity E2E Tests – Azure ARC Agent'
   dependsOn: ['BuildAndStageProjects']
   pool:
     name: 'MSALMSIAZUREARC'
+  condition: and(succeeded(), eq(variables['RunManagedIdentityE2EArcTests'], 'true'))
 
   steps:
   - template: template-run-mi-e2e-azurearc.yaml
@@ -108,10 +109,11 @@ jobs: #Build and stage projects
       TargetFramework: 'net8.0'
 
 - job: 'RunManagedIdentityE2ETestsOnImds'
-  displayName: 'Managed Identity E2E Tests – VM / IMDS'
+  displayName: 'Managed Identity E2E Tests – VM / IMDS'
   dependsOn: ['BuildAndStageProjects']
   pool:
     name: 'ID4SMSIHostedAgent'
+  condition: and(succeeded(), eq(variables['RunManagedIdentityE2EVmTests'], 'true'))
 
   steps:
   - template: template-run-mi-e2e-imds.yaml