Move Umbraco Package Schema and custom-elements to root level

[korbi551]

Prerequisites

Fixes #16667

Description

According to the problem, the generation of the json schema and the user-defined elements was moved to the root level. The wc-analyze and generate:jsonschema:dist scripts have therefore been changed and added to build:for:npm.
Unfortunately I could not determine if changing the scripts causes problems.

[github-actions]

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