Update trainingyt.py: Migrate to transforms.v2, f-strings, and modern syntax

[Sai-prashanth-2006]

Fixes #3858

Description

This PR modernizes trainingyt.py by resolving deprecated API usage and aligning the codebase with current Python and PyTorch best practices:

• Migrated the torchvision.transforms pipeline to the v2 API, replacing the deprecated ToTensor transform
• Updated GarmentClassifier.__init__ to use the Python 3 super().__init__() syntax
• Replaced all .format() string literals with f-strings for improved readability and performance

No functional behavior is changed by this PR.

Checklist

• The issue being fixed is referenced in the description
• This PR addresses a single issue
• Labels from the original issue have been added to this PR
• No unrelated changes are included

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3871

• 📄 Preview Python docs built from this PR

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