No longer use publish-unit-test-result-action

We are no longer using EnricoMi/publish-unit-test-result-action for
publishing of tests results, due to a known bug in the action, causing
wrong association of tests results with workflows
(EnricoMi/publish-unit-test-result-action#12).
Failing tests still will cause the job to be reported as failed.

.github/workflows/client.yml

@@ -47,25 +47,12 @@ jobs:
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
 
-      - name: Create test results directory
-        run: mkdir test-results
-
       - name: Run Go tests
         run: |
           docker run \
-            --volume $GITHUB_WORKSPACE/test-results:/mnt/test-results \
             --workdir /go/src/github.com/keep-network/keep-ecdsa \
             go-build-env \
-            gotestsum --junitfile /mnt/test-results/unit-tests.xml
-
-      - name: Publish unit test results
-        uses: EnricoMi/publish-unit-test-result-action@v1
-        if: always()
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          files:  ./test-results/unit-tests.xml
-          check_name: Go Test Results # name under which test results will be presented in GitHub (optional)
-          comment_on_pr: false # turns off commenting on Pull Requests
+            gotestsum
 
       - name: Login to Google Container Registry
         if:  |