Investigate Code Review Endpoints for Error Budget Thresholds

As part of the effort to define custom measurement thresholds for our Web and API endpoints, we first need to review our endpoints and determine what the thresholds should be.

This issue has more details: gitlab-com/gl-infra/scalability#1315

More details can be found in the epic &7125 (closed).

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I originally had a table in the description, but I moved that to a comment below