ci(dashboard): pull lime-packages test reports from another side

[ccasanueva7]

Summary

• New scheduled workflow collect-lime-results.yml that downloads report.xml artifacts from recent fcefyn-testbed/lime-packages CI runs and commits them under docs/ci-results/results/.
• Runs every 6 h plus manual workflow_dispatch.
• Lets the dashboard render per-job test details and stops the "Report ↗" links from 404'ing.

Why

The original plan (lime-packages pushing results into this repo) requires merging a PR to lime-packages' master, which the LibreMesh community has not accepted. This is the inverse direction: this repo pulls from lime-packages instead. No changes are required in lime-packages.

Setup required after merge

• Add a repo secret named LIME_PACKAGES_TOKEN to fcefyn_testbed_utils (fine-grained PAT scoped to fcefyn-testbed/lime-packages, Actions: Read).
• Trigger the workflow manually once from the Actions tab to backfill recent runs; afterwards the cron keeps it warm.

Test plan

• Add LIME_PACKAGES_TOKEN secret
• Run "Collect lime-packages test results" manually from Actions
• Verify a commit appears on develop adding files under docs/ci-results/results/
• Open the dashboard and confirm "Report " links open the JUnit XML instead of 404