ci: remove --timings flag for Next.js repo e2e tests

This doesn't seem to provide any value for us. It just adds some test run time and
instability to our suite, since this ends up attempting to read a `test-timings.json` file
from disk (fails every time) and then makes a request to fetch timings data from a private
Vercel endpoint, which sometimes fails with a 403 for some reason.

Author: serhalp

.github/workflows/test-e2e.yml

@@ -198,7 +198,7 @@ jobs:
           NODE_ENV: production
           NEXT_EXTERNAL_TESTS_FILTERS: ${{ steps.test-filters.outputs.filters }}
           NEXT_TEST_SKIP_RETRY_MANIFEST: ${{ steps.test-filters.outputs.skip-retry }}
-        run: node run-tests.js -g ${{ matrix.group }}/${{ needs.setup.outputs.total }} -c ${TEST_CONCURRENCY} --type e2e --timings
+        run: node run-tests.js -g ${{ matrix.group }}/${{ needs.setup.outputs.total }} -c ${TEST_CONCURRENCY} --type e2e
         working-directory: ${{ env.next-path }}
 
       - name: Upload Test Results