Generalize burnup chart service for other metrics
What does this MR do?
This generalizes the burnup chart service because we would use the same data computed from iterating through events for other metrics.
This also moves the GraphQL burnup time series under a report field. The frontend will be changed to use this new endpoint in another MR so that we won't have problems during deploy. After those are deployed, we can then remove the old endpoint.
We are doing this now because this endpoint is still behind a feature flag and it is easier to change / remove this now before it becomes publicly available.
Related to #233707 (comment 413526459)
Screenshots
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
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Separation of EE specific content
Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers -
Informed Infrastructure department of a default or new setting change, if applicable per definition of done
Security
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
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Label as security and @ mention @gitlab-com/gl-security/appsec -
The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
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