In Data migrator, Handle multiple-levels of the call hierarchy

[yanavasileva]

Acceptance Criteria (Required on creation)

Tackle #4994 first.
Multiple-levels of the call hierarchy make it necessary to query multiple times for “migrator” jobs until nothing is left anymore and all “levels” have been migrated.

• We might have solved this already when adding pagination to the jobs query (executing the query again and again until no “migrator” jobs are left anymore”).
• Implementation idea: We could use a do-while loop: as long as jobs of type “migrator” exist, we try again. Once no job is left, we stop the loop.
• Check: Are there any situations in which the migration would stop because there are no more jobs but actually new jobs arrive later?
• Test coverage with at least 3 levels of sub processes

Hints

• Time estimate: 3 days

Links

• depends on In Data migrator, Make C7 and C8 queries paginated #4994

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