Refactor Ci::Pipeline's config_sources enum
What does this MR do?
This enum is now defined in the Ci::PipelineEnums module, allowing EE to extend this enum without having to modify Ci::Pipeline directly.
What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/8244
Does this MR meet the acceptance criteria?
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Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
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Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
Security reports checked/validated by reviewer