Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Make various failure conditions in PDO unconditional errors

This includes TypeErrors, ValueErrors, Error for uninitialized objects
and invalid user classes/callable instanciation

Make various failure conditions in PDO unconditional errors

This includes TypeErrors, ValueErrors, Error for uninitialized objects
and invalid user classes/callable instanciation

Closes GH-6212

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