Add internal event tracking ci_build_minutes

What does this MR do and why?

Adds internal event tracking to collect sum of total monthly ci build minutes

• Tracks events when builds > 0 minutes complete and UpdateBuildMinutesService is executed.
• Metric added for total monthly ci build minutes
• Metric added for total monthly ci build minutes filtered on runner_type == "group_type"
• Metric added for total monthly ci build minutes filtered on runner_type == "instance_type"
• Metric added for total monthly ci build minutes filtered on runner_type == "project_type"
• event records:
  • build's duration in minutes passed as the value
  • the runner_type used to process the build as label

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

NOTE: In the following screenshots and in the events that are sent to snowplow - value === ci_build_minutes (aka build duration in minutes rounded to 2 decimals) & label === the type of runner that processed the build (ie instance, project, group)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

This is a backend internal event tracker. To test this locally the easiest way is to use the basic event monitor and trigger the action that tracks the event.

1. **To start an internal event monitor: ** From within the gitlab repository run rails runner scripts/internal_events/monitor.rb track_ci_build_minutes_with_runner_type
2. From your local host - run a pipeline in one of your projects (for best results, set a sleep for several minutes in the middle of a few of your stages)
3. Observe the event monitor update as each build completes

Alternative local testing:

1. From a terminal --> run rails runner scripts/internal_events/monitor.rb track_ci_build_minutes_with_runner_type
2. In another tab or terminal windwo --> run a rails console bundle exec rails console
3. trigger a series of events from the rails console and observe the internal event monitor updating

  Gitlab::InternalEvents.track_event("track_ci_build_minutes_with_runner_type", additional_properties: {label: "group_type", value: 5.73})
  Gitlab::InternalEvents.track_event("track_ci_build_minutes_with_runner_type", additional_properties: {label: "project_type", value: 0.87})
  Gitlab::InternalEvents.track_event("track_ci_build_minutes_with_runner_type", additional_properties: {label: "instance_type", value: 9.36})

Related to #481877 (closed)