Rename build files from TARGETS to BUCK (group ID: -3982651347005005195)

[bigfootjon]

Reviewed By: bigfootjon

Differential Revision: D104414874

[meta-codesync]

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[pytorch-bot]

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[Copilot]

Pull request overview

This PR migrates a few extension build definitions from TARGETS files into BUCK files, aligning with the repository’s build-file naming/migration approach and enabling conditional fbcode vs non-fbcode target definitions via migration macros.

Changes:

• Removed TARGETS files under extension/tensor and extension/runner_util (and extension/runner_util/test).
• Updated corresponding BUCK files to use fbcode_target / non_fbcode_target wrappers around existing define_common_targets entrypoints.
• Updated extension/pytree/test/BUCK to wrap test rules with fbcode_target.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
extension/tensor/TARGETS	Removed legacy TARGETS file now merged into BUCK.
extension/tensor/BUCK	Adds migration macro wrappers for fbcode/non-fbcode target definition.
extension/runner_util/TARGETS	Removed legacy TARGETS file now merged into BUCK.
extension/runner_util/BUCK	Adds migration macro wrappers for fbcode/non-fbcode target definition.
extension/runner_util/test/TARGETS	Removed legacy TARGETS file now merged into BUCK.
extension/runner_util/test/BUCK	Adds migration macro wrappers; fbcode path passes is_fbcode=True.
extension/pytree/test/BUCK	Wraps unittest targets in fbcode_target for migration compatibility.

Comments suppressed due to low confidence (1)

extension/pytree/test/BUCK:1

• non_fbcode_target is loaded but never used in this file. Dropping the unused symbol from the build_file_migration.bzl load would reduce noise and avoid confusion about whether a non-fbcode version of these tests is expected.

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