[XPU][CI] feat: add Intel XPU CI pipeline support to builds dashboard

[zxd1997066]

Summary

The builds dashboard currently only maps CUDA CI job names to test groups.
Intel XPU CI jobs (.buildkite/intel_jobs/) use different labels and are not recognized, so only few group columns appear when viewing the intel CI pipeline.

Changes

src/lib/intel_jobs.ts (new file)

• Mirrors the structure of test-areas.ts for the Intel XPU pipeline
• Ships a static seed mapping (instant on first load) covering all groups
  defined under .buildkite/intel_jobs/
• Refreshes from GitHub in the background every hour to pick up label changes

src/lib/test-groups.ts

• resolveGroupsToJobConditions: includes Intel job name conditions when
  filtering by group
• aggregateJobsByGroup: falls back to Intel mapping if a job name is not
  recognized by the CUDA mapping

Testing

vllm-project/vllm#51755 will standardize Intel XPU job group/label names.
Then verified with mock data, confirming that group columns in the dashboard's Intel CI pipeline (for builds containing XPU jobs) populate correctly and status dots accurately reflect job states.

[vercel]

@zxd1997066 is attempting to deploy a commit to the Inferact Inc Team on Vercel.

A member of the Team first needs to authorize it.

[jikunshang]

@simon-mo @khluu can you help take a review? thanks!