ci: Produce a single WPT log artifact

GitHub supports adding files to an artifact in parallel, as long as the
filenames are unique. This makes it easier to download build results
when more than a single builder fails.

.github/workflows/main.yml

@@ -224,7 +224,7 @@ jobs:
         uses: actions/upload-artifact@v3
         if: ${{ failure() }}
         with:
-          name: wpt${{ matrix.chunk_id }}-logs-linux
+          name: wpt-logs-linux
           path: |
             test-wpt.${{ matrix.chunk_id }}.log
             wpt-jsonsummary.${{ matrix.chunk_id }}.log

.github/workflows/wpt-nightly.yml

@@ -76,7 +76,7 @@ jobs:
       - name: Archive logs
         uses: actions/upload-artifact@v3
         with:
-          name: wpt${{ matrix.chunk_id }}-logs-linux
+          name: wpt-logs-linux
           path: |
             test-wpt.${{ matrix.chunk_id }}.log
             wpt-jsonsummary.${{ matrix.chunk_id }}.log

etc/ci/wpt-nightly-update.sh

@@ -31,7 +31,7 @@ function main() {
     for n in $(seq 1 "${MAX_CHUNK_ID}")
     do
         code=""
-        update_metadata "wpt${n}-logs-linux/test-wpt.${n}.log" || \
+        update_metadata "wpt-logs-linux/test-wpt.${n}.log" || \
             code="${?}"
         if [[ "${code}" != "" ]]; then
             return "${code}"