docs(team::practices): add operations vs project work for services

Why is this change being made?

What

Add new chart for operations vs project work for the services that we own:

• all services
• gitaly
• praefect
• ci-runners
• customersdot

Why

It's important to track the operations vs project work to see where most of our backlog is and where most of our time is being spent on.

Reference: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/17365

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
  • The when to get approval handbook section explains the workflow in more detail
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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