fix: don't panic in test and bench if ops not available (#23055)

Fixes regression introduced in
https://github.com/denoland/deno/pull/22112 that
removed checks if `Deno.test` or `Deno.bench` are not used in respective
subcommands.

Closes https://github.com/denoland/deno/issues/23041

cli/js/40_bench.js

@@ -47,6 +47,11 @@ function bench(
   optionsOrFn,
   maybeFn,
 ) {
+  // No-op if we're not running in `deno bench` subcommand.
+  if (typeof op_register_bench !== "function") {
+    return;
+  }
+
   if (!registeredWarmupBench) {
     registeredWarmupBench = true;
     const warmupBenchDesc = {

cli/js/40_test.js

@@ -198,6 +198,11 @@ function testInner(
   maybeFn,
   overrides = {},
 ) {
+  // No-op if we're not running in `deno test` subcommand.
+  if (typeof op_register_test !== "function") {
+    return;
+  }
+
   let testDesc;
   const defaults = {
     ignore: false,