feat(ci): support GitHub badge sources

[cjeanner]

Read optional ci_github_sources from pattern frontmatter and pass them through the pattern CI partial. Collect these sources for the main CI dashboard so GitHub results appear alongside existing bucket results.

Fetch configured raw GitHub JSON files using the selected badge set. Reuse JSON metadata parsing for pattern, platform, version, and date; this preserves hyphenated pattern names without relying on filename splitting. Reuse fetched JSON during enrichment and skip unavailable GitHub files without dropping other results.

Bucket discovery cannot list raw GitHub files. This adds that discovery path while keeping source configuration with its owning pattern and preserving existing bucket, preview, and time-range behavior.

Assisted-by: Codex

[openshift-ci]

Hi @cjeanner. Thanks for your PR.

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[cjeanner]

@darkdoc heya! we discussed that feature over past week, but I'm not sure you pushed anything related to that support. Feel free to discard this PR is there's already something - and lemme know if #738 needs an update to get the badge in.

[cjeanner]

Superseded by #741