Remove defaultAccess from Keystone constructor

[timleslie]

This API is no longer used or required.

[changeset-bot]

🦋 Changeset detected

Latest commit: d8d2880

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

This PR includes changesets to release 7 packages

Name	Type
@keystone-next/keystone-legacy	Major
@keystone-next/fields	Patch
@keystone-next/keystone	Patch
@keystone-next/adapter-prisma-legacy	Patch
@keystone-next/test-utils-legacy	Patch
@keystone-next/benchmarks-legacy	Patch

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