Add Static Analysis custom error budget targets
What does this MR do and why?
Describe in detail what your merge request does and why.
Add Static Analysis custom error budget targets according to https://docs.gitlab.com/ee/development/application_slis/rails_request_apdex.html#how-to-adjust-the-urgency in order for us to comply with gitlab-com/gl-infra/scalability#1451 (closed).
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