Fix a transient failure in mini_pipeline_graph_spec

This spec failed reliably with a specific run order (see issue), the reasons for which are still unknown. This simplification resolves the failure.

Closes #34323 (closed)

added 62 commits

• b55cf073...3e0757f2 - 61 commits from branch master
• 8d72f097 - Fix a transient failure in mini_pipeline_graph_spec

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assigned to @DouweM

resolved all discussions

approved this merge request

enabled an automatic merge when the pipeline for 8d72f097 succeeds

merged

mentioned in commit b3a52448

@rspeicher Thanks!