fix: zero-pad years below 1000 in date/datetime formatting

[Danish-sarwar1]

convertDebeziumDate, convertDebeziumMilliseconds and convertDebeziumMicroseconds printed the year with %d, so a MySQL value like 0202-04-17 was serialized to S3 as "202-04-17" (9 chars). Redshift COPY (json 'auto') rejects such values with err 1205 "Invalid Date Format - length must be 10 or more" and the loader retries the same batch forever, stalling the sink and burning cluster cycles.

Pad the year with %04d so years below 1000 serialize as valid YYYY-MM-DD and load faithfully. Years 1000-9999 are unaffected.

[coderabbitai]

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