poetry-core 2.0.0 can no longer build when the sourcetree contains symlinks outside itself

Description

Since the release of poetry-core v2.0.0, twine can no longer build a poetry package whose source tree contains symlinks outside itself. Previously it could. Now it fails with errors like

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
    main()
  File "/usr/local/lib/python3.10/dist-packages/pyproject_hooks/_in_process/_in_process.py", line 373, in main
    json_out["return_val"] = hook(**hook_input["kwargs"])
  File "/usr/local/lib/python3.10/dist-packages/pyproject_hooks/_in_process/_in_process.py", line 280, in build_wheel
    return _build_backend().build_wheel(
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/api.py", line 58, in build_wheel
    return WheelBuilder.make_in(
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/builders/wheel.py", line 91, in make_in
    wb.build(target_dir=directory)
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/builders/wheel.py", line 131, in build
    self._copy_module(zip_file)
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/builders/wheel.py", line 308, in _copy_module
    self._add_file(wheel, file.path, file.relative_to_target_root())
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/builders/builder.py", line 374, in relative_to_target_root
    path = self.relative_to_source_root()
  File "/tmp/build-env-cf76kflm/lib/python3.10/site-packages/poetry/core/masonry/builders/builder.py", line 371, in relative_to_source_root
    return self.path.relative_to(self.source_root)
  File "/usr/lib/python3.10/pathlib.py", line 818, in relative_to
    raise ValueError("{!r} is not in the subpath of {!r}"
ValueError: '/true/location/of/myschema.json' is not in the subpath of '/mypackage/src' OR one path is relative and the other is absolute.

Is this deliberate? I realise it is an edge case, and probably there are arguments for disallowing these symlinks.

(It doesn't seem to be possible for me to raise an issue against poetry-core itself.)

Workarounds

Poetry Installation Method

other

Operating System

Ubuntu 22.04

Poetry Version

poetry-core v2.0.0

Poetry Configuration

-

Python Sysconfig

No response

Example pyproject.toml

No response

Poetry Runtime Logs

-

Start in poetry/core/masonry/builders/builder.py, especially relative_to_source_root and relative_to_target_root, then follow the wheel builder call in poetry/core/masonry/builders/wheel.py. Reproduce the reported wheel build with a source-tree symlink pointing outside the tree and determine the intended handling. Done means the reported package builds successfully without regressing existing wheel-building behavior.