ci: benchmark only BenchmarkBenchdata (#3007)

A bit radical, but I'm open to other benchmarks we should include.

Essentially, in an effort to have a small amount of meaningful
benchmarks, I'd like for these to only be those in BenchmarkBenchdata.
Yes, I recognize this is tooting my own horn, but I think they are good
benchmarks that tell us, overall, if the GnoVM on a few reference
programs got slower or faster, and I found them useful in the past while
doing manual execution.

Most other benchmarks are micro-benchmarks, which aren't likely to
change often or to give us useful insight. I'm open to suggestions for
others that make sense to be tracked, but I think it's for the better if
we keep the number low so the CI for benchmarks can run in just a few
minutes.

.github/workflows/benchmark-master-push.yml

@@ -34,9 +34,12 @@ jobs:
           go-version: "1.22.x"
 
       - name: Run benchmark
+        # add more benchmarks by adding additional lines for different packages;
+        # or modify the -bench regexp.
         run: |
-          go test -benchmem -bench=. ./... -run=^$ \
-          -cpu 1,2 -timeout 50m | tee benchmarks.txt
+          set -xeuo pipefail && (
+            go test ./gnovm/pkg/gnolang -bench='BenchmarkBenchdata' -benchmem -run='^$' -v -cpu=1,2
+          ) | tee benchmarks.txt
 
       - name: Download previous benchmark data
         uses: actions/cache@v4