Fix flakey quant fusion test

[metascroy]

As titled, we fix the flakey test by using SQNR >= 50 rather than torch.allclose

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14547

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❌ 3 New Failures, 2 Cancelled Jobs

As of commit 7e4d6d0 with merge base 16ced4e ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t a69fbbfe6694cd7045e9331b0499b43545b177fe864eb72d779d5f36c3e6efc9 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 5a380deb89039ab7d95b9360ed0db336093e654688d2949b9ee4ed3888a4df83 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 2a684612fc9c4d3c9fac0094137c3da84cedac0075dcfa08366436c9e50339c6 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-binary-size-linux-gcc / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh)

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