sig,badges: Add total number of jobs run per SIG to each SIG badge

[brianmcarey]

What this PR does / why we need it:

The number of failed runs per SIG does not give a clear picture on its own without the total number of job runs per SIG as each SIG has a different number of lanes that runs against each PR.

This includes the total number of jobs run per SIG in each SIG badge and sets the badge colour to reflect the percentage of failed jobs out of total jobs run.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #66

Special notes for your reviewer:

/cc @dhiller @xpivarc

Checklist

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Approvers are expected to review this list.

• Design: A design document was considered and is present (link) or not required
• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
• Community: Announcement to kubevirt-dev was considered

Release note:

[dhiller]

/approve

[xpivarc]

Thanks!