Add news fragment

Author: abravalheri

newsfragments/4611.feature.rst

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+Added support for the environment variable
+``SETUPTOOLS_DANGEROUSLY_SKIP_PYPROJECT_VALIDATION=true``, allowing users to bypass
+the validation of ``pyproject.toml``.
+This option should be used only as a last resort when resolving dependency
+issues, as it may lead to improper functioning.
+Users who enable this setting are responsible for ensuring that ``pyproject.toml``
+complies with setuptools requirements.