build: bump UCX to v1.21.0 for v1.4.0 (OPS-7781)

[pvijayakrish]

• Pin nixl_ucx_ref to immutable tag v1.21.0 (was branch v1.20.x)
• Drop vestigial nixl_ucx_efa_ref (consumed nowhere; ancestor of v1.21.0)
• Bump UCX compliance attribution in lockstep (native_packages.yaml)
• Remove Intel llm-scaler XPU ucx patch: both hunks upstream since v1.21.0, git apply fails fatally on the new tag

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Summary by CodeRabbit

• Chores
  • Updated the bundled UCX component to version 1.21.0.
  • Simplified build configuration by relying on the upstream UCX support for Intel GPU data transfers.
  • Removed obsolete patch handling and an outdated UCX-specific configuration override.
  • Preserved existing licensing, source, image, and related dependency settings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 8e696637-3fd7-4ca1-96e9-16b0404b4e85

📥 Commits

Reviewing files that changed from the base of the PR and between cde3ca9 and bcae0b4.

📒 Files selected for processing (3)

• container/compliance/native_packages.yaml
• container/context.yaml
• container/templates/wheel_builder.Dockerfile

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Walkthrough

UCX references are updated to v1.21.0, the NIXL UCX EFA pin is removed, and the wheel builder’s obsolete XPU patch download and application steps are replaced with upstream availability comments.

Changes

UCX upgrade

Layer / File(s)	Summary
UCX version pinning container/compliance/native_packages.yaml, container/context.yaml	The UCX package and CUDA 13 NIXL UCX reference now use v1.21.0; the NIXL UCX EFA reference is removed.
Obsolete patch workflow removal container/templates/wheel_builder.Dockerfile	The build no longer downloads or conditionally applies the XPU UCX patch and documents its upstream availability since UCX v1.21.0.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lists the changes but does not follow the required template or include the required Related Issues section.	Add the required Overview, Details, and Where should the reviewer start? sections, and include the Related Issues section with the issue link or no-issue confirmation.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the UCX bump to v1.21.0 and matches the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[devin-ai-integration]

Devin Review found 1 potential issue.

[datadog-official]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 39.49% (-8.64%)

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