ci(NODE-5482): append node version to evergreen benchmark task (#600)

Author: W-A-James

.evergreen/config.yml

@@ -209,7 +209,7 @@ tasks:
         vars:
           TS_VERSION: "next"
           TRY_COMPILING_LIBRARY: "false"
-  - name: run-benchmarks-node
+  - name: run-benchmarks-node-18
     commands:
       - func: fetch source
         vars:
@@ -247,4 +247,4 @@ buildvariants:
     display_name: RHEL 9.0 perf
     run_on: rhel90-dbx-perf-large
     tasks:
-      - run-benchmarks-node
+      - run-benchmarks-node-18