Run one testsuite with observers enabled in CI (#13869)

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Use EXTENSIONS instead of SKIPIF sections in *.phpt

This also fixes skipped tests due to different naming "zend-test"
instead of "zend_test" and "PDO" instead of "pdo":

- ext/do

Use EXTENSIONS instead of SKIPIF sections in *.phpt

This also fixes skipped tests due to different naming "zend-test"
instead of "zend_test" and "PDO" instead of "pdo":

- ext/dom/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/simplexml/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/xmlreader/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/zend_test/tests/observer_sqlite_create_function.phpt

EXTENSIONS section is used for the Windows build to load the non-static
extensions.

Closes GH-13276

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Initialize run time cache in PDO methods (#9818)

Without the memset the memory was uninitialized and the new test segfaulted when accessing the memory in _zend_observe_fcall_begin().