Fix GH-20214: PDO::FETCH_DEFAULT unexpected behavior with setFetchMode#21434

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iliaal wants to merge 3 commits intophp:PHP-8.4from

iliaal:fix/gh-20214-pdo-fetch-default

Commits on Apr 3, 2026

Fix GH-20214: PDO::FETCH_DEFAULT unexpected behavior with PDOStatement::setFetchMode
iliaal
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Fix flags preservation and move test to PDO core
iliaal
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Commits on Apr 8, 2026

Use table-based queries in gh20214 test for Firebird compat
iliaal
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