extension_flat_tensor should depend on executorch_core

[kirklandsign]

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[pytorch-bot]

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❌ 3 New Failures

As of commit 5649ea4 with merge base e60958a ():

NEW FAILURES - The following jobs have failed:

• .github/workflows/build-presets.yml (gh)
• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / unittest / linux / linux-job (gh)
  backends/xnnpack/test/passes/test_decompose_cat_pass.py::TestDecomposeCatPass::test_qs8_cat_gt_10

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