ci: bsim tests: Merge and publish results as in twister flow

Let's merge the results and publish them as in the
twister workflow.
It is nicer to not select files by hand and produces
a nicer report.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

.github/workflows/bsim-tests.yaml

@@ -191,21 +191,27 @@ jobs:
           RESULTS_FILE=${ZEPHYR_BASE}/${bsim_uart_test_results_file} \
           SEARCH_PATH=tests/bsim/drivers/uart/ tests/bsim/run_parallel.sh
 
-      - name: Upload Test Results
+      - name: Merge Test Results
+        run: |
+          pip3 install junitparser junit2html
+          junitparser merge ./bsim_*/*bsim_results.*.xml ./twister-out/twister.xml junit.xml
+          junit2html junit.xml junit.html
+
+      - name: Upload Unit Test Results in HTML
         if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: bsim-test-results
+          name: HTML Unit Test Results
+          if-no-files-found: ignore
           path: |
-            ./bsim_bt/52_bsim_results.xml
-            ./bsim_bt/53_bsim_results.xml
-            ./bsim_bt/53_bsim_split_results.xml
-            ./bsim_net/52_bsim_results.xml
-            ./bsim_uart/uart_bsim_results.xml
-            ./twister-out/twister.xml
-            ./twister-out/twister.json
-            ${{ github.event_path }}
-          if-no-files-found: warn
+            junit.html
+
+      - name: Publish Unit Test Results
+        uses: EnricoMi/publish-unit-test-result-action@v2
+        with:
+          check_name: Bsim Test Results
+          files: "junit.xml"
+          comment_mode: off
 
       - name: Upload Event Details
         if: always()