Docs: Revert dynamic exclude_patterns

[geographika]

This PR rolls back the change added in #12315 as this broke incremental builds.

I closed #12419 which attempted to exclude one of the indexes based on the build type. It was beoming overly complex with little benefit.

The messages index.rst: document is referenced in multiple toctrees: ['index', 'index_pdf'], selecting: index_pdf <- api/index are INFO so not warnings. If they had been warnings, they could be silenced in conf.py using:

suppress_warnings = [
    "toc.multiple_toc_parents",  # Suppresses "document is referenced in multiple toctrees"
]

cc @dbaston

[DelazJ]

@geographika I didn't look into the details but did you try embedding the files contents under .. only:: latex for one and .. only:: not latex for the other (and maybe with :orphan: in both)?

[geographika]

@geographika I didn't look into the details but did you try embedding the files contents under .. only:: latex for one and .. only:: not latex for the other (and maybe with :orphan: in both)?

Thanks for the suggestion @DelazJ but I still get the gdal\doc\source\api\index.rst: document is referenced in multiple toctrees: ['index', 'index_pdf'], selecting: index_pdf <- api/index messages even with the following in index_pdf.rst:

:orphan:

.. only:: latex

It looks like it might only be solved with a patch to Sphinx.

[geographika]

See also https://github.com/orgs/sphinx-doc/discussions/12999 and sphinx-doc/sphinx#13038