Move targets.bzl to proper location

[bigfootjon]

This enables #21429 to work correctly (see failing BUCK CI job there)

It's currently failing due to targets.bzl being exported from Meta to the wrong location. This fixes that on GH.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21495

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❌ 1 New Failure, 1 Cancelled Job

As of commit 16b438e with merge base 4e285f4 ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  Warning: An error occurred while preparing SDK package Android Emulator: https://dl.google.com/android/repository/emulator-linux_x64-15917651.zip.

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / unittest-editable / linux / linux-job (gh)
  ##[error]The operation was canceled.

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🟢 Ready to approve

The functional changes are small and align the Buck load paths with the configured fbsource cell mapping, with only minor documentation clarity nits.

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Review details

Comments suppressed due to low confidence (1)

runtime/core/BUCK:4

• The header comment says shared targets must be defined in a local targets.bzl, but this BUCK file now loads them from @fbsource//xplat/executorch/runtime/core:targets.bzl (shim_et cell). Updating the comment would reduce confusion when someone goes looking for runtime/core/targets.bzl in OSS.

# Any targets that should be shared between fbcode and xplat must be defined in
# targets.bzl. This file can contain xplat-only targets.

load("@fbsource//xplat/executorch/runtime/core:targets.bzl", "define_common_targets")

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