batcheval: include version in fixture directory

This benchmark is sometimes failing in CI and I cannot reproduce
locally. The error is consistent with a leftover fixture from an older
version (which shouldn't happen because CI should be cleaning up the
repo).

This change adds the version to the fixture name so that this kind of
cross-version problem cannot occur. This is a good idea regardless of
the CI issue.

The logging around the fixture is also improved.

Informs #97061

Release note: None
Epic: none

pkg/kv/kvserver/batcheval/cmd_refresh_range_bench_test.go

@@ -19,6 +19,7 @@ import (
 	"testing"
 
 	"github.com/cockroachdb/cockroach/pkg/base"
+	"github.com/cockroachdb/cockroach/pkg/clusterversion"
 	"github.com/cockroachdb/cockroach/pkg/kv/kvserver/batcheval"
 	"github.com/cockroachdb/cockroach/pkg/roachpb"
 	"github.com/cockroachdb/cockroach/pkg/settings/cluster"
@@ -210,6 +211,9 @@ func setupMVCCPebble(b testing.TB, dir string, lBaseMaxBytes int64, readOnly boo
 func setupData(
 	ctx context.Context, b *testing.B, emk engineMaker, opts benchDataOptions,
 ) (storage.Engine, string) {
+	// Include the current version in the fixture name, or we may inadvertently
+	// run against a left-over fixture that is no longer supported.
+	verStr := fmt.Sprintf("v%s", clusterversion.TestingBinaryVersion.String())
 	orderStr := "linear"
 	if opts.randomKeyOrder {
 		orderStr = "random"
@@ -218,22 +222,28 @@ func setupData(
 	if opts.readOnlyEngine {
 		readOnlyStr = "_readonly"
 	}
-	loc := fmt.Sprintf("refresh_range_bench_data_%s%s_%d_%d_%d",
-		orderStr, readOnlyStr, opts.numKeys, opts.valueBytes, opts.lBaseMaxBytes)
+	loc := fmt.Sprintf("refresh_range_bench_data_%s_%s%s_%d_%d_%d",
+		verStr, orderStr, readOnlyStr, opts.numKeys, opts.valueBytes, opts.lBaseMaxBytes)
 	exists := true
 	if _, err := os.Stat(loc); oserror.IsNotExist(err) {
 		exists = false
 	} else if err != nil {
 		b.Fatal(err)
 	}
 
+	absPath, err := filepath.Abs(loc)
+	if err != nil {
+		absPath = loc
+	}
+
 	if exists {
+		log.Infof(ctx, "using existing refresh range benchmark data: %s", absPath)
 		testutils.ReadAllFiles(filepath.Join(loc, "*"))
 		return emk(b, loc, opts.lBaseMaxBytes, opts.readOnlyEngine), loc
 	}
 
 	eng := emk(b, loc, opts.lBaseMaxBytes, false)
-	log.Infof(ctx, "creating refresh range benchmark data: %s", loc)
+	log.Infof(ctx, "creating refresh range benchmark data: %s", absPath)
 
 	// Generate the same data every time.
 	rng := rand.New(rand.NewSource(1449168817))