CI: remove step summary

CTest errors were ignored in favor or `tee`'s exit code

.github/workflows/ci.yml

@@ -77,11 +77,7 @@ jobs:
         timeout-minutes: 10
 
       - name: Test
-        run: |
-          echo "## CTest output" >> $GITHUB_STEP_SUMMARY
-          echo '```' >> $GITHUB_STEP_SUMMARY
-          ctest --output-on-failure -C Debug . | tee -a $GITHUB_STEP_SUMMARY
-          echo '```' >> $GITHUB_STEP_SUMMARY
+        run: ctest --output-on-failure -C Debug .
         env:
           UBSAN_OPTIONS: print_stacktrace=1
         timeout-minutes: 2
@@ -156,11 +152,7 @@ jobs:
       - name: Build
         run: cmake --build .
       - name: Test
-        run: |
-          echo "## CTest output" >> $GITHUB_STEP_SUMMARY
-          echo '```' >> $GITHUB_STEP_SUMMARY
-          ctest --output-on-failure -C Debug . | tee -a $GITHUB_STEP_SUMMARY
-          echo '```' >> $GITHUB_STEP_SUMMARY
+        run: ctest --output-on-failure -C Debug .
         env:
           UBSAN_OPTIONS: print_stacktrace=1