Fix MODEL_CONVERTER_LIB_DIR path resolution for VGF tests (#20907)

[psiddh]

Summary:

After bumping model-converter to v0.9.0 (D109721412), ~160 ARM VGF tests
(mxfp_linear, mxfp_conv2d) started SKIPPING because model_converter_installed()
returns False on sandcastle.

Root cause: MODEL_CONVERTER_LIB_DIR was set to
$(location fbsource//third-party/nvidia-nsight-systems:linux-x86_64)/host-linux-x64
which relies on string concatenation after $(location) expansion. In Buck2 test
sandboxes, this pattern can produce an invalid path because the export_file
artifact reference may not expose subdirectories properly.

Fix: Create a dedicated export_file target for the host-linux-x64 subdirectory
and reference it directly with $(location), eliminating the string concatenation.

Impact: −160 SKIPPING tests

Reviewed By: rascani

Differential Revision: D111819484

[pytorch-bot]

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❌ 1 New Failure, 3 Cancelled Jobs, 1 Unrelated Failure, 7 Unclassified Failures

As of commit f496e8a with merge base 430ae39 ():

NEW FAILURE - The following job has failed:

• Apple / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 128

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build Presets (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Check Labels / Check labels (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  # This PR needs a release notes: label
• Test ARM Backend (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Test QNN Backend (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Test Vulkan Backend (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Test WebGPU Backend (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Test XNNPACK Backend (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)

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

• Build documentation / build (buck2) / Build doc (gh)
• Lint / lintrunner (gh)
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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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 D111819484.

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[Copilot]

Pull request overview

This PR adjusts the Buck2 test environment for Arm VGF tests to make MODEL_CONVERTER_LIB_DIR resolve reliably in sandboxed test execution, avoiding path construction via string concatenation after $(location) expansion.

Changes:

• Replace $(location ...:linux-x86_64)/host-linux-x64 with a direct $(location ...:host-linux-x64-libs) reference for MODEL_CONVERTER_LIB_DIR.

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[Copilot]

Pull request overview

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