[CI] Create Github Job Summary for failing E2E tasks (#13069)

Unfortunately, our E2E tests use custom LIT format so I wasn't able to
make `llvm-lit` generate the results into a JSON file. That meant that I
have to redirect the entire output into a log file and Github Actions
won't be able to show intermediate progress until `llvm-lit` finishes
execution.

Another thing worth mentioning is that these summaries aren't
"searchable" via Github's search queries (unlike comments), but I think
it's still a usability improvement because it would allow to see all the
failures on a single page.

.github/workflows/sycl-linux-run-tests.yml

@@ -268,12 +268,19 @@ jobs:
  run: |
  cmake -GNinja -B./build-e2e -S./llvm/sycl/test-e2e -DSYCL_TEST_E2E_TARGETS="${{ inputs.target_devices }}" -DCMAKE_CXX_COMPILER="$(which clang++)" -DLLVM_LIT="$PWD/llvm/llvm/utils/lit/lit.py" ${{ steps.cmake_opts.outputs.opts }}
  - name: SYCL End-to-end tests
+ shell: bash {0}
  if: inputs.tests_selector == 'e2e'
  env:
  LIT_OPTS: -v --no-progress-bar --show-unsupported --show-pass --show-xfail --max-time 3600 --time-tests ${{ inputs.extra_lit_opts }}
  run: |
- ninja -C build-e2e check-sycl-e2e
-
+ ninja -C build-e2e check-sycl-e2e > e2e.log 2>&1
+ exit_code=$?
+ cat e2e.log
+ if [ $exit_code -ne 0 ]; then
+ # TODO: XPASS/UNRESOLVED
+ awk '/^Failed Tests|Testing Time/{flag=1}/FAILED: CMakeFiles/{flag=0}flag' e2e.log >> $GITHUB_STEP_SUMMARY
+ fi
+ exit $exit_code
  - name: Build SYCL CTS tests
  if: inputs.tests_selector == 'cts'
  env: