Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Fix #44643: bound parameters ignore explicit type definitions

If `SQLDescribeParam()` fails for a parameter, we must not assume
`SQL_LONGVARCHAR` for any param which is not `PDO_PARAM_LO

Fix #44643: bound parameters ignore explicit type definitions

If `SQLDescribeParam()` fails for a parameter, we must not assume
`SQL_LONGVARCHAR` for any param which is not `PDO_PARAM_LOB`. At least
mapping `PDO_PARAM_INT` to `SQL_INTEGER` should be safe, and not
introduce a BC break.

Closes GH-6973.

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