Build EXTENSION_DATA_LOADER with size_test

[swolchok]

size_test.cpp uses FileDataLoader; no idea how this happens to work currently. Had to remove conflict with ARM_BAREMETAL because the size test is built for that too.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• Fix missing cmake_deps.toml dep from size_test to extension_data_loader #12744
• Don't build MmapDataLoader if sys/mman.h isn't available and we're not on Windows #12743
• Set up CMake build for extension/evalue_util #12691
• -> Build EXTENSION_DATA_LOADER with size_test #12678
• Prefix target_link_options_shared_lib with ExecuTorch #12667

[pytorch-bot]

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❌ 1 New Failure, 1 Cancelled Job

As of commit e6c83db with merge base 56b0074 ():

NEW FAILURE - The following job has failed:

• Apple / build-demo-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74

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

• trunk / test-models-macos (vit, xnnpack-quantization-delegation) / macos-job (gh)
  ##[error]The operation was canceled.

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