Rename build files from TARGETS to BUCK (group ID: -3191970166037227153)

[meta-codesync]

Reviewed By: bigfootjon

Differential Revision: D104414897

[pytorch-bot]

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❌ 2 New Failures

As of commit 9984ae1 with merge base 9889c7c ():

NEW FAILURES - The following jobs have failed:

• Docathon Labels Sync / check-labels (gh)
  Process completed with exit code 1.
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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[bigfootjon]

Review automatically exported from Phabricator review in Meta.

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