fix(misc): make generated schemas compliant with json schema spec

[leosvelperez]

Current Behavior

The generated schema.json for a workspace generator and for an Nx plugin are using the id property which is deprecated.

Expected Behavior

The generated schema.json for a workspace generator and for an Nx plugin should use the $id property.

Related Issue(s)

Fixes #

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	nx affected --target=build --base=89c70f226470b7918c2f4010d3c91f771a79fbce --parallel --max-parallel=3
	nx affected --target=e2e --base=89c70f226470b7918c2f4010d3c91f771a79fbce
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[MichaelDeBoey]

@leosvelperez Should we have a migration to change this in the already existing schema.json too?

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