ci/cd: migrate backend linter to v2. fixed unit test workflow (#400)

.github/workflows/unit-tests.yml

@@ -2,11 +2,11 @@ name: Unit Tests
 on:
   push:
     branches: [main]
-    paths: 
+    paths:
       - "backend/**"
   pull_request:
     branches: [main]
-    paths: 
+    paths:
       - "backend/**"
 
 jobs:
@@ -25,6 +25,7 @@ jobs:
       - name: Run backend unit tests
         working-directory: backend
         run: |
+          set -e -o pipefail
           go test -v ./... | tee /tmp/TestResults.log
       - uses: actions/upload-artifact@v4
         if: always()