Add a saturation metric for Anthropic quota
Problem
Similar to Add a saturation metric for google Vertex quota (gitlab-com/gl-infra/scalability#2403 - closed), we should monitor the saturation of the Anthropic quota. So that we can proactively act on a corrective action for https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/ai-assist/-/issues/370+.
Reference: !5983 (merged)
Edited by Shinya Maeda