Fix GH-13517: Multiple test failures when building with --with-expat

The reflection failure is because the XML extension is used to check the
module dependency information, but that exte

Fix GH-13517: Multiple test failures when building with --with-expat

The reflection failure is because the XML extension is used to check the
module dependency information, but that extension can be configured to
not depend on ext/libxml, resulting in a different output. The solution
is to check another extension instead.

The test failures in ext/xml/tests are because of different behaviour
between libxml2 and Expat error handling. These are expected differences
and the solution is to split the tests.

Closes GH-13522.

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Fix GH-11160: Few tests failed building with new libxml 2.11.0

It's possible to categorise the failures into 2 categories:
- Changed error message. In this case we either duplicate the

Fix GH-11160: Few tests failed building with new libxml 2.11.0

It's possible to categorise the failures into 2 categories:
- Changed error message. In this case we either duplicate the test and
modify the error message. Or if the change in error message is
small, we use the EXPECTF matchers to make the test compatible with both
old and new versions of libxml2.
- Missing warnings. This is caused by a change in libxml2 where the
parser started using SAX APIs internally [1]. In this case the
error_type passed to php_libxml_internal_error_handler() changed from
PHP_LIBXML_ERROR to PHP_LIBXML_CTX_WARNING because it internally
started to use the SAX handlers instead of the generic handlers.
However, for the SAX handlers the current input stack is empty, so
nothing is actually printed. I fixed this by falling back to a
regular warning without a filename & line number reference, which
mimicks the old behaviour. Furthermore, this change now also shows
an additional warning in a test which was previously hidden.

[1] https://gitlab.gnome.org/GNOME/libxml2/-/commit/9a82b94a94bd310db426edd453b0f38c6c8f69f5

Closes GH-11162.

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