Replace debug print with logger in train_nemo.py

[Copilot]

Addresses code review feedback to replace a debug print statement with proper logging.

Changes

• Replaced print("*****************") with logger.debug("Setting up validation data with configured parameters") at line 282 in apps/whisper_fine_tuning/src/core/train/train_nemo.py

The change uses the existing logger instance and provides a meaningful debug message describing the validation setup step.

# Before
print("*****************")

model.setup_validation_data(val_cfg)

# After
logger.debug("Setting up validation data with configured parameters")
model.setup_validation_data(val_cfg)

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