[EZ] Replace pytorch-labs with meta-pytorch

[ZainRizvi]

This PR replaces all instances of pytorch-labs with meta-pytorch in this repository now that the pytorch-labs org has been renamed to meta-pytorch

Changes Made

• Replaced all occurrences of pytorch-labs with meta-pytorch, except for ao which is in pytorch now
• Skipped binary files and files larger than 1MB due to GitHub api payload limits in the script to cover all repos in this org. Will do a more manual second pass later to cover any larger files

Files Modified

This PR updates files that contained the target text.

Generated by automated script on 2025-08-12T20:57:41.370213+00:00Z

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/2914

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As of commit 40961ea with merge base dc0441a ():
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