Move createImagesContext inside makeCreateContext

[timleslie]

No functional changes, just groups the code in a slightly more intuitive way.

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🦋 Changeset detected

Latest commit: 446233b

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

This PR includes changesets to release 4 packages

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@keystone-next/keystone	Patch
@keystone-next/test-utils-legacy	Patch

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