Try working around missing Docker Compose v1 in hosted runners (#5386)

* Try workaround missing Docker Compose v1 in hosted runners

* Revert "Try workaround missing Docker Compose v1 in hosted runners"

This reverts commit e4b0775.

* Try switching to the new "smoke test" pool

.azure-pipelines/ultimate-pipeline.yml

@@ -4646,7 +4646,7 @@ stages:
     variables:
       smokeTestAppDir: "$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest"
     pool:
-      vmImage: ubuntu-latest
+      name: azure-linux-smoke-scale-set
 
     steps:
     - template: steps/clone-repo.yml
@@ -4730,7 +4730,7 @@ stages:
       variables:
         smokeTestAppDir: "$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest"
       pool:
-        vmImage: ubuntu-latest
+        name: azure-linux-smoke-scale-set
 
       steps:
         - template: steps/clone-repo.yml
@@ -4809,7 +4809,7 @@ stages:
     variables:
       smokeTestAppDir: "$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest"
     pool:
-      vmImage: ubuntu-latest
+      name: azure-linux-smoke-scale-set
 
     steps:
     - template: steps/clone-repo.yml
@@ -4899,7 +4899,7 @@ stages:
     variables:
       smokeTestAppDir: "$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest"
     pool:
-      vmImage: ubuntu-latest
+      name: azure-linux-smoke-scale-set
 
     steps:
     - template: steps/clone-repo.yml
@@ -4963,7 +4963,7 @@ stages:
     variables:
       smokeTestAppDir: "$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest"
     pool:
-      vmImage: ubuntu-latest
+      name: azure-linux-smoke-scale-set
 
     steps:
     - template: steps/clone-repo.yml
@@ -5035,7 +5035,7 @@ stages:
       installCmd: "dpkg -i ./datadog-dotnet-apm*_amd64.deb"
       linuxArtifacts: "linux-packages-linux-x64"
     pool:
-      vmImage: ubuntu-latest
+      name: azure-linux-smoke-scale-set
 
     steps:
     - template: steps/clone-repo.yml