[CI] Run one benchmark test during CI to ensure its basic functioning. NFC (#26296)

Author: sbc100

.circleci/config.yml

@@ -1099,7 +1099,9 @@ jobs:
       - run-tests-linux:
           # some native-dependent tests fail because of the lack of native
           # headers on emsdk-bundled clang
-          test_targets: "other jslib skip:other.test_native_link_error_message"
+          # Include a single test from test_benchmark.py to ensure it's always
+          # kept functional.
+          test_targets: "other jslib benchmark.test_primes skip:other.test_native_link_error_message"
   test-browser-chrome:
     executor: ubuntu-lts
     environment: