[build Folder Migration] Move build/executorch-config.cmake

[jathu]

Summary

A series of diffs as a part of #9117.

Test plan

CI

cc @larryliu0820 @lucylq

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9318

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❌ 2 New Failures, 1 Pending, 1 Unrelated Failure

As of commit 02dc976 with merge base 1011fdc ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / test-arm-reference-delegation / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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