[Bug]: http-specs, dashboard should show manifest from released http-specs version, not latest main branch

[XiaofeiCao]

Describe the bug

As title suggests.
I noticed that in current dashboard, manifests are generated from main branch. IMHO, dashboard should only show cases that already got released. Coverage data for unreleased cases is not very meaningful, since SDK can't add tests for unreleased cases.
If we want to see unreleased cases, we could add something like a toggle to each of the manifest, that choose between latest released and unreleased version. By default, we should show released cases.

This lies somewhat between a bug and a discussion, and I haven't considered implementation details.

Reproduction

These two cases are not released but shown.

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.