pdo_pgsql: escaped question marks inside dollar quoted strings

Allow "??" in dollar quoted strings for backwards compatibility,
as it was a viable workaround to insert question marks wit

pdo_pgsql: escaped question marks inside dollar quoted strings

Allow "??" in dollar quoted strings for backwards compatibility,
as it was a viable workaround to insert question marks without them
being parsed as placeholders.

Add a deprecation notice to tell that the escape is no longer
necessary within dollar quotes and that its usage is deprecated.

Ref bug #14244

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