Fix Cadence test failures (#18655)

[aliafzal]

Summary:

• Fix test_pass_filter.py: use clear()+update() instead of rebinding
  ALL_CADENCE_PASSES in tearDown to keep the same dict object reference
• Fix test_g3_ops.py: remove obsolete run_and_compare flag
• Thread file_name through export_and_run_model → runtime.run_and_compare
  → runtime.run → Executor so the runner loads the correct .bpte file
• Fix facto_util.py: import random_manager instead of seeded_random_manager
  to match the current FACTO submodule

Test Plan:
OSS:

1. python -m pytest backends/cadence/aot/tests/ -v — 488 passed
2. `python -m pytest examples/cadence/operators/test_g3_ops.py

Reviewed By: zonglinpeng

Differential Revision: D99168797

Pulled By: aliafzal

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18655

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✅ You can merge normally! (2 Unrelated Failures)

As of commit 5b756b9 with merge base 3a6314e ():

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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