Rename build files from TARGETS to BUCK (group ID: -6933935006879497618)

[meta-codesync]

Reviewed By: bigfootjon

Differential Revision: D104414853

[pytorch-bot]

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[bigfootjon]

Review automatically exported from Phabricator review in Meta.

[bigfootjon]

Review automatically exported from Phabricator review in Meta.

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