Remove `:dag_pipeline_tab` flag
What does this MR do?
The :dag_pipeline_tab
has been on by default since %13.2, so I think we can remove it now.
Screenshots (strongly suggested)
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation (if required) -
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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.