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fix: ensure File transport flushes all data before emitting finish (#2594)

Fixes #1504

The File transport was emitting the 'finish' event before all buffered
data was actually written to disk. This caused data loss when calling
logger.end() followed by process.exit().

The root cause was that the transport's internal PassThrough stream
could finish before the underlying fs.WriteStream had flushed to disk.

This adds a _final() method that waits for the destination file stream
to complete before signaling that the transport has finished.

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