Update strings in Arm unittests

[oscarandersson8218]

Update strings in checks for operators. The old checks became invalid when #4109 was merged.

Change-Id: I89e398d4b6467244ce732cafa08850fb8a2c754d

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4143

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit bab34b0 with merge base c2147cb ():

NEW FAILURE - The following job has failed:

• trunk / test-models-macos (cmake, mul, portable, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-models-macos (cmake, add, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

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

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

• trunk / test-custom-ops-macos (cmake) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

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[digantdesai]

Thanks.

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@digantdesai has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@digantdesai merged this pull request in 28638d7.