Restore ETL pipeline completion log message

[Copilot]

The cats logger migration removed the success completion log message, making it difficult to confirm successful pipeline execution in monitoring systems.

Changes

• Added logger[F].info("ETL Pipeline completed successfully") after S3 write operation in EtlPipeline.run()

// Write to S3
_ <- s3Writer.writeParquet(dataStream, outputPath)
_ <- logger[F].info("ETL Pipeline completed successfully")

The message is properly sequenced in the effect system to only log on successful completion.

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