fix: Abort the admin develop command if serve is false

[adevinwild]

Issue
Based on this issue, the admin ui continues to start with the serve property set to false

Solution
In the packages/medusa/src/commands/develop.js I retrieved the config of the @medusajs/admin plugin, in case serve is set to false the adminCLI process is not runned

Note
I don't know if it's the best way to handle it though

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