Remove 16 redundant skipped test stubs in test_scalars.py

[psiddh]

Summary: These test functions are empty stubs (body=pass) that are permanently skipped because their functionality is tested by the corresponding _tosa_INT and _tosa_BI tests. Removing them reduces the ai_infra_mobile_platform oncall's SKIPPING count by 16.

Differential Revision: D112509983

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❗ 1 Merge Blocking SEVs

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• (merge blocking) [Maintenance] - Due to #190347 we're advancing a maintenance planned to Sunday to today

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❌ 2 New Failures

As of commit 92c14ab with merge base 931ba24 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (profiling) / build (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128
• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t c392ac93987b14469ae0ce10de395f68096610f932cbdcd5470230f337257564 /exec failed with exit code 1

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[meta-codesync]

@psiddh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D112509983.

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[Copilot]

Pull request overview

This PR simplifies the Arm backend scalar-op test suite by removing redundant, permanently skipped (empty pass) Ethos-U scalar test stubs, reducing noise in test reporting.

Changes:

• Removed multiple @pytest.mark.skip(...); def ...(): pass Ethos-U scalar test stubs for add/sub/mul/div INT.
• Changed the FP-profile right-shift test marker from skip to xfail(..., strict=True) so it will execute and be expected to fail.

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