Fix pdo_oci tests for PHP 8.1

Closes GH-9051

Run POD_Firebird tests on AppVeyor CI

We also fix gh8626.phpt for the firebird driver by allowing negative
status codes as well. We mark the other two test cases as xfail for
the fi

Run POD_Firebird tests on AppVeyor CI

We also fix gh8626.phpt for the firebird driver by allowing negative
status codes as well. We mark the other two test cases as xfail for
the firebird driver for now.

Closes GH-8666.

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Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Add test case for errorCode()