Remove unused functions from utils package

[timleslie]

This package is for our own internal usage, so if we no longer use functions then we should stop maintaining them.

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🦋 Changeset detected

Latest commit: b6672c4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@keystone-next/utils-legacy	Major
@keystone-next/access-control-legacy	Patch
@keystone-next/adapter-knex-legacy	Patch
@keystone-next/adapter-mongoose-legacy	Patch
@keystone-next/adapter-prisma-legacy	Patch
@keystone-next/app-graphql-legacy	Patch
@keystone-next/fields-legacy	Patch
@keystone-next/keystone-legacy	Patch
@keystone-next/api-tests-legacy	Patch
@keystone-next/keystone	Patch
@keystone-next/test-utils-legacy	Patch

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