[CI] Fix: incorrect downstream job execution when only build_gpu/xpu is skipped

[EmmonsCurse]

Motivation

• Prevent downstream jobs from running when build_gpu/xpu is skipped
• Reduce unnecessary CI execution and resource usage

Modifications

• Gate downstream jobs with build output (wheel_path)
• Skip downstream jobs when build is skipped
• Align skip logic across GPU and XPU workflows
• Fix: Invalid secret, github-token is not defined in Publish Job

Usage or Command

N/A

Accuracy Tests

N/A

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[EmmonsCurse]

/skip-ci ci_iluvatar
/skip-ci ci_hpu
/skip-ci build_gpu

[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (develop@0b4c1cb). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #6958   +/-   ##
==========================================
  Coverage           ?   73.66%           
==========================================
  Files              ?      399           
  Lines              ?    55827           
  Branches           ?     8802           
==========================================
  Hits               ?    41126           
  Misses             ?    11787           
  Partials           ?     2914           

Flag	Coverage Δ
GPU	73.66% <ø> (?)

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