refactor(dev-infra): use shelljs instead of fs-extra for benchmark utils (#37594)

We added a new dependency on `fs-extra` to the dev-infra package. We can
remove this dependency and replace it with `shelljs` that is extensively
used in other places already.

The motiviation is that we can reduce dependencies needed for
for consumption of the shared dev-infra package.

PR Close #37594

dev-infra/tmpl-package.json

@@ -35,7 +35,6 @@
     "@bazel/typescript": "<from-root>",
     "brotli": "<from-root>",
     "clang-format": "<from-root>",
-    "fs-extra": "<from-root>",
     "json5": "^1.0.1",
     "protractor": "<from-root>",
     "rollup": "<from-root>",