Implement AtomicProcessing service

What does this MR do?

This implements atomic processing service that is able in bulk to update multiple builds, stages and pipelines.

This uses in-memory structure to calculate statuses and uses an efficient fetch of DAG dependencies for efficient processing

This still performs some redundant operations, but overall it should be significantly faster processing pipelines of 1000 builds, with multiple DAG dependencies, as it removes a number of N+1 problems present in previous implementation.

This also is order-independent, so it is able to easily reschedule itself once needed.

This code is also concurrent safe, as if needed the further processing will be re-scheduled that will resolve any conflicts.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

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:

• 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
• Security reports checked/validated by a reviewer from the AppSec team