Updated training_example.ipynb

[dinarkino]

What does this PR do?

The original notebook doesn't work out of the box. After the following fixes, it works.
Fixes

• updated diffusers[training] version to the 0.27.2
• fixed "TODO" in one of the cells by adding a missing link to another notebook with Unconditional image generation
• changed logging_dir to project_dir, because that was a reason for the error (this is also mentioned here: Fixed variable name #412)
• added the create_repo function for the creation of a repository for the model save if we choose to upload the model to the Hugging Face Hub. Before that, it caused an error during repository pulling

Who can review?

@anton-l

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