VCS subdirectory information is lost in lockfiles

[juneoh]

• Poetry version: 1.3.2
• Python version: 3.11.1
• OS version and name: Ubuntu 20.04
• pyproject.toml: (described in Issue section)

• I am on the latest stable Poetry version, installed using a recommended method.
• I have searched the issues of this repo and believe that this is not a duplicate.
• I have consulted the FAQ and blog for any relevant entries or release notes.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option) and have included the output below.

Issue

First and foremost, thanks for the great tool!

I found an edge case with multiple private package sources hosted on git. When my poetry project (package A) requires another poetry project (package B), and that project in turn has a Git dependency (package C) with a subdirectory, the subdirectory information is lost during writing the lock file, resulting errors like below for subsequent installs or adds:

Unable to determine package info for path: REDACTED

Command ['/tmp/tmpmsqyswsj/.venv/bin/python', '-'] errored with the following return code 1, and output:
Traceback (most recent call last):
  File "<stdin>", line 9, in <module>
  File "/tmp/tmpmsqyswsj/.venv/lib/python3.11/site-packages/build/__init__.py", line 208, in __init__
    _validate_source_directory(srcdir)
  File "/tmp/tmpmsqyswsj/.venv/lib/python3.11/site-packages/build/__init__.py", line 109, in _validate_source_directory
    raise BuildException(f'Source {srcdir} does not appear to be a Python project: no pyproject.toml or setup.py')
build.BuildException: Source REDACTED does not appear to be a Python project: no pyproject.toml or setup.py
input was : import build
import build.env
import pep517

source = 'REDACTED'
dest = '/tmp/tmpmsqyswsj/dist'

with build.env.IsolatedEnvBuilder() as env:
    builder = build.ProjectBuilder(
        srcdir=source,
        scripts_dir=env.scripts_dir,
        python_executable=env.executable,
        runner=pep517.quiet_subprocess_runner,
    )
    env.install(builder.build_system_requires)
    env.install(builder.get_requires_for_build('wheel'))
    builder.metadata_path(dest)

No fallback setup.py file was found to generate egg_info.

The above error indicates that Poetry is trying to install at the root directory of package C, whereas it is inside a subdirectory instead. poetry.lock looks like this:

[package.dependencies]
REDACTED = {git = "REDACTED", tag = "REDACTED"}

The subdirectory is gone, whereas package B's pyproject.toml states:

[tool.poetry.dependencies]
REDACTED = {git = "REDACTED", subdirectory="REDACTED", tag = "REDACTED"}

This is because poetry.packages.locker.Locker._dump_package()'s VCSDependency case lacks the handling of the subdirectory.

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