Arm backend: Add VGF minimal example to out-of-box testing

[SaoirseARM]

Summary

Adding the VGF minimal example to automated test flow

• Minor fixes to VGF minimal example

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13861

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 2 Pending, 1 Unrelated Failure

As of commit 626e3c2 with merge base 0cca3ca ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-editable / windows / windows-job (gh)
  Process completed with exit code 1.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-nxp-neutron / linux-job (gh) (trunk failure)
  test_split_group_convolution__applied_by_default

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[SaoirseARM]

@pytorchbot label ciflow/trunk

[SaoirseARM]

@pytorchbot label "release notes: none"

[SaoirseARM]

@pytorchbot label 'partner: arm'