cleanup(core): use isNpmProject and cleanup project graph utils

[meeroslav]

Current Behavior

• On several locations in the codebase we check whether project is an external npm package by checking the project's type. In project-graph there is already dedicated function for this - isNpmProject.
• The normalize-nx-json is missing comments and code is a bit complex to read
• The buildable-libs-utils in utils folder is unused. There is a duplicate in utilities that is used.

Expected Behavior

• We should use dedicated function for checking whether project is an npm package
• Normalize normalizeNxJson should be easy to read and should have comments to guide reader
• Unused duplicate of buildable-libs-utils should be removed

Related Issue(s)

Fixes #

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[FrozenPandaz]

We should keep this file and the above file for backwards compatibility. Some people might still import from this path even though it's a deep import.

We can remove them in Nx v13.

[meeroslav]

Ok, I'll mark those functions then as deprecated

[github-actions]

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