Arm backend: Fix to ensure nested control flow graphs are delegated

[SaoirseARM]

Summary

• Added function to ensure True/False come in the right order.
• Update to quantizer to ensure submodules are converted first.
• Update to scalar pass for nested conditions.

cc @digantdesai @SS-JIA @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18010

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❌ 4 New Failures

As of commit 0fb0a34 with merge base 569e7a9 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t dfa6b6188ea21a04c6d794796349d9f2993c76613ca46bb2e654120747a57bac /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t da17401133509adc6af31ed74a9710769ebdcca37ea77268d5c90d7c3422f200 /exec failed with exit code 1
• trunk / test-qnn-model (fp32, ic3) / linux-job (gh)
  RuntimeError: Command docker exec -t b50de8202fe46748c26ad2fbe0c3b87228a5903064a57039ee8971c1c4896ff8 /exec failed with exit code 56
• trunk / test-qnn-optimum-model (fp32, pvt) / linux-job (gh)
  RuntimeError: Command docker exec -t 857ee2e7d02fdc3df7a94d83b954514174ee47b64997bfca0043e59ce41e4c7f /exec failed with exit code 92

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[SaoirseARM]

@pytorchbot label ciflow/trunk

[SaoirseARM]

@pytorchbot label "release notes: arm"

[SaoirseARM]

@pytorchbot label 'partner: arm'

[SaoirseARM]

Test failures seem unrelated to this change.