test(pdo_pgsql): Exclude `pdo` implicitly required by `pdo_pgsql` from `EXTENSIONS` (#16116)

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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Fix GH-9411: PgSQL large object resource is incorrectly closed

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-9411.