Enable input_format_json_ignore_unknown_keys_in_named_tuple by default

Why it matters

This feature allows ClickHouse to ignore unknown keys when parsing JSON input into named tuples. It prevents errors caused by unexpected fields in JSON data, improving robustness and user experience when importing JSON with extra keys.

How to use it

Users don't need to take any action to enable this feature, as it is enabled by default. If needed, it can be controlled via the input_format_json_ignore_unknown_keys_in_named_tuple setting.