Fix nested local dependencies (#3368)

[lucasvieirasilva]

This PR resolves the issue when the project has more than 2 levels of path dependencies.

/lib
    /pkg1
        pyproject.toml
    /pkg2
        pyproject.toml
/apps
    /app1
        pyproject.toml

Solution

Check when the source package is directory to use the property source_url as root_dir instead of using the self._lock.path.parent if the source package is not a directory type the installation process continues normally.

That makes poetry-core resolve correctly the full path property.

Pull Request Check List

Resolves: #3368

• Added tests for changed code.
• Updated documentation for changed code.

[lucasvieirasilva]

Duplicated fix #4246

[github-actions]

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