test(ci): ensure vs test uses MTP in pipeline

Author: Per Kops

.github/workflows/post-integration.yml

@@ -45,7 +45,7 @@ jobs:
         run: dotnet build -c Release --no-restore /p:UseSourceLink=true
 
       - name: 🧪 Run unit tests
-        run: dotnet test -c Release --no-build --filter "Category!=Integration"
+        run: dotnet test -c Release --no-build --filter-query "/[category!=integration]" --ignore-exit-code 8
 
       - name: ⏩ Merge to stable-branch
         run: |

.github/workflows/pre-integration.yml

@@ -55,4 +55,4 @@ jobs:
         run: dotnet build -c Release --no-restore /p:UseSourceLink=true
 
       - name: 🧪 Run unit tests
-        run: dotnet test -c Release --no-build --filter "Category!=Integration"
+        run: dotnet test -c Release --no-build --filter-query "/[category!=integration]" --ignore-exit-code 8

global.json

@@ -2,5 +2,8 @@
   "sdk": {
       "rollForward": "latestMajor",
       "allowPrerelease": false
+  },
+  "test": {
+      "runner": "Microsoft.Testing.Platform"
   }
 }