Prepare release 7.0.0 (#9598)

* Prepare release version 7.0.0

* Add note to changelog

Co-authored-by: pytest bot <pytestbot@gmail.com>
Co-authored-by: Florian Bruhin <me@the-compiler.org>

changelog/9355.bugfix.rst

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-Fixed error message prints function decorators when using assert in Python 3.8 and above.

changelog/9396.bugfix.rst

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-Ensure :attr:`pytest.Config.inifile` is available during the :func:`pytest_cmdline_main <_pytest.hookspec.pytest_cmdline_main>` hook (regression during ``7.0.0rc1``).

changelog/9404.doc.rst

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-Added extra documentation on alternatives to common misuses of `pytest.warns(None)` ahead of its deprecation.

changelog/9488.deprecation.rst

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-If custom subclasses of nodes like :class:`pytest.Item` override the
-``__init__`` method, they should take ``**kwargs``. See
-:ref:`uncooperative-constructors-deprecated` for details.
-
-Note that a deprection warning is only emitted when there is a conflict in the
-arguments pytest expected to pass. This deprecation was already part of pytest
-7.0.0rc1 but wasn't documented.

changelog/9505.doc.rst

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-Clarify where the configuration files are located. To avoid confusions documentation mentions
-that configuration file is located in the root of the repository.

changelog/9521.trivial.rst

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-Add test coverage to assertion rewrite path.