debug: windows flake (#18135)

Make sure Bazel logs shows every errors so that we can debug flakes +
fix a small flake on Windows by updating the sleep command to a
`Start-Sleep` instead of a PowerShell nested command (otherwise we had
double nesting which is absurdely slow)

.github/scripts/run-bazel-ci.sh

@@ -94,6 +94,11 @@ print_bazel_test_log_tails() {
     local rel_path="${target#//}"
     rel_path="${rel_path/://}"
     local test_log="${testlogs_dir}/${rel_path}/test.log"
+    local reported_test_log
+    reported_test_log="$(grep -F "FAIL: ${target} " "$console_log" | sed -nE 's#.* \(see ([^)]+/test\.log)\).*#\1#p' | head -n 1 || true)"
+    if [[ -n "$reported_test_log" ]]; then
+      test_log="$reported_test_log"
+    fi
 
     echo "::group::Bazel test log tail for ${target}"
     if [[ -f "$test_log" ]]; then