[CICD] update coverage report & update megatron version of metax ci workflow (flagos-ai#1199)

### PR Category
CICD

### PR Types
Improvements

### PR Description
- Update the coverage report interface to support multi-chip reports.
- Update the megatron-lm-fl version of metax ci workflow

Author: Darryl233

.github/workflows/functional_tests_train.yml

@@ -220,11 +220,13 @@ jobs:
           echo "Python location: $(which python)"
           echo "Python version: $(python --version)"
 
-          # Install Megatron-LM-FL
-          pip install megatron_core==0.1.0+megatron0.15.0rc7 \
-            --extra-index-url https://resource.flagos.net/repository/flagos-pypi-hosted/simple \
-            || { echo "❌ Megatron-LM-FL install failed"; exit 1; }
-          echo "✅ Megatron-LM-FL installed successfully"
+          git clone \
+            "https://github.com/flagos-ai/Megatron-LM-FL.git" /tmp/Megatron-LM-FL
+          git -C /tmp/Megatron-LM-FL checkout d092f8df49f7c0b5b4cae42d036b7e4a26b8fc81
+
+          echo "Installing Megatron-LM-FL via pip..."
+          pip install /tmp/Megatron-LM-FL --no-build-isolation --root-user-action=ignore \
+            || { echo "Megatron-LM-FL install failed"; exit 1; }
 
           # Install TransformerEngine-FL and dependencies
           git clone --depth 1 https://github.com/flagos-ai/TransformerEngine-FL.git /workspace/TransformerEngine-FL \

.github/workflows/unit_tests_common.yml

@@ -258,11 +258,12 @@ jobs:
       - name: Upload coverage report to FlagCICD
         if: steps.unit_test.outcome == 'success'
         continue-on-error: true
-        uses: flagos-ai/FlagOps/actions/post-pytest-report@v2
+        uses: flagos-ai/FlagOps/actions/post-pytest-report@v2.0.4
         env:
           NO_PROXY: "flagcicd-inner.flagos.net"
         with:
           user_id: '000000000000000000'
           backend_url: 'http://flagcicd-inner.flagos.net:8000/metrics/'
           report_path: '${{ env.PROJECT_ROOT }}/coverage-report/coverage.json'
           fail_on_error: 'false'
+          runner_set_name: ${{ fromJson(inputs.runs_on)[0] }}