Disable im2row transform by default, add a flag to enable it (#18693)

[mcremon-meta]

Summary:

As titled. It typically hurts now that we have proper conv support:
{F1987095578}

This also introduces EdgePassesConfig to make it easier to do such things in the future. Details in https://docs.google.com/document/d/1c1mKse2-F1Ejh8Sg2pl-pBp3HZaIBdiUuhp86dyuEMA/edit?tab=t.0

Reviewed By: ethansfng

Differential Revision: D97356070

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18693

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❌ 1 New Failure, 2 Unrelated Failures

As of commit a332f87 with merge base 6020c29 ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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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[meta-codesync]

@mcremon-meta has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97356070.

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