ui.isDisabled: true is ignored

[molomby]

According to the docs, I can set ui.isDisabled: true to disable the Admin UI:

isDisabled (default: false): If isDisabled is set to true then the Admin UI will be completely disabled.

But when keystone start us run, the CLI code passes { ui: true, ... } in the second arg, here, which overrides the configured isDisabled value here.

Related to #8046?

Reproduction

• Create a project
• Set ui: { isDisabled: true }
• keystone build
• keystone start
• Get error:

$ keystone start
✨ Starting Keystone
✨ Connecting to the database
✨ Creating server
✅ GraphQL API ready
✨ Preparing Admin UI Next.js app
Error: Could not find a production build in the '/my-keystone-app/.keystone/admin/.next' directory. Try building your app with 'next build' before starting the production server. https://nextjs.org/docs/messages/production-start-no-build-id
    at NextNodeServer.getBuildId (/my-keystone-app/node_modules/next/dist/server/next-server.js:345:23)
    at new Server (/my-keystone-app/node_modules/next/dist/server/base-server.js:151:29)
    at new NextNodeServer (/my-keystone-app/node_modules/next/dist/server/next-server.js:172:9)
    at NextServer.createServer (/my-keystone-app/node_modules/next/dist/server/next.js:179:24)
    at async /my-keystone-app/node_modules/next/dist/server/next.js:200:31
    at async NextServer.prepare (/my-keystone-app/node_modules/next/dist/server/next.js:160:24)
    at async start (/my-keystone-app/node_modules/@keystone-6/core/scripts/cli/dist/keystone-6-core-scripts-cli.cjs.dev.js:1277:5)

Expected

App should start without the Admin UI.