Fix Admin UI generation to allow files returned from getAdditionalFiles to overwrite the files generated by Keystone

[emmatown]

The original intent of this was to allow overwriting the files that Keystone generates but the comparison was broken because it was comparing unresolved paths with resolved ones.

[changeset-bot]

🦋 Changeset detected

Latest commit: 37c3a64

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

This PR includes changesets to release 2 packages

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

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[timleslie]

👍

[gautamsi]

@mitchellhamilton does this also overwrite the file with typescript? I have noticed that f you have same file name created as custom pages in typescript, it does copy and use Typescript file but the js file from template is still there.