ci: exclude performance tests from CI pipeline

Performance tests are flaky due to environment sensitivity and
can fail on shared CI infrastructure even when code is correct.
This change filters out tests with 'Performance' in their name
from the CI test run to improve build reliability.

Performance tests can still be run locally when needed.

Author: 23min

.github/workflows/build.yml

@@ -26,4 +26,4 @@ jobs:
         run: dotnet build --configuration Release --no-restore
 
       - name: Test
-        run: dotnet test --configuration Release --no-build
+        run: dotnet test --configuration Release --no-build --filter "FullyQualifiedName!~Performance"