Add rate limit to packagecloud paths

Summary

A very large burst of requests can cause packagecloud internally to stop responding to all requests. We should consider a rate limit that will prevent this, but not interfere with normal operations.

Related Incident(s)

Originating issue(s): production#16013 (closed)

Desired Outcome/Acceptance Criteria

Associated Services

Corrective Action Issue Checklist

• Link the incident(s) this corrective action arose from
• Give context for what problem this corrective action is trying to prevent re-occurring
• Assign a severity label (this is the highest sev of related incidents, defaults to 'severity::4')
• Assign a priority (this will default to 'Reliability::P4' but should match the severity of the related incident)