chore(common): remove unused helpers

[holic]

forgot to clean this up in #2972

this is one of the last few places where we import from solidity parser, and I think we can migrate the rest to forge ast output

[changeset-bot]

⚠️ No Changeset found

Latest commit: 35cffdd

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR