Usage Ping: Add hourly application request volume

What does this MR do?

Depends on: !35343 (merged)

This adds a new field application_requests_per_hour to the topology Usage Ping sent from customer's Omnibus deployments.

We pull this value from a pre-recorded Prometheus per-second rate and take the avg_over_time for 1w.

We will eventually use this data to compute our team's NSM which is defined as:

Requests / Hour (Rolling 7 day average) / ( (GB of RAM * 0.004237) + (Cores * 0.031611) )

Example

{
   "duration_s": 123,
   "application_requests_per_hour": 3600,
   "nodes": [...]
}

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry Usage ping is covered by our privacy policy and does not require change log entries.
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done
• Test in Omnibus container

Closes #217698 (closed)