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Introduce API for Change Failure Rate DORA metric

Pavel Shutsin requested to merge 299407-dora4-api-support-for-change-failure-rate-backend-service into master

What does this MR do and why?

Introduces 4th DORA metric which calculates the rate between incidents and deployments.

Database information

== 20220322143441 AddDoraIncidentsCount: reverting ============================
-- remove_column(:dora_daily_metrics, :incidents_count, :integer)
   -> 0.0098s
== 20220322143441 AddDoraIncidentsCount: reverted (0.0121s) ===================

== 20220322143441 AddDoraIncidentsCount: migrating ============================
-- add_column(:dora_daily_metrics, :incidents_count, :integer)
   -> 0.0082s
== 20220322143441 AddDoraIncidentsCount: migrated (0.0083s) ===================

Select query: https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/9370/commands/33136#visualize-depesz

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Related to #299407 (closed)

Edited by Pavel Shutsin

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