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]

Hi there @korbi551, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

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[lauraneto]

Hi @korbi551 ,

Thank you for taking the time to look into this one! 🙌
We will review this as soon as possible.

[iOvergaard]

We don't need to add the generation here as that is already being done in the prepack step:

Suggested change

	"build:for:npm": "npm run build -- --declaration && npm run generate:manifest && npm run package:validate && npm run generate:jsonschema:dist && npm run wc-analyze",
	"build:for:npm": "npm run build -- --declaration && npm run generate:manifest && npm run package:validate",

[iOvergaard]

This should be moved to the local .gitignore file inside the Client folder. Please also verify if the file custom-elements.json is properly ignored.