🏭 feat: Add Safe Parallel Ingestion Consumers (#317)

* feat: add parallel ingestion consumers and logging

* updated doc an less logging

* batch pipeline now fails fast

* Fix parallel ingestion rollback race condition

* simplify cleanup tracking

* Fix async ingestion rollback guard for failed first batch

* Guard async ingestion rollback until an insert succeeds

* Track completed shielded inserts before rollback cleanup

* fix: clean up cancelled parallel ingestion

* fix: harden parallel ingestion failure handling

* fix: preserve parallel ingestion context order

* fix: close parallel ingestion edge cases

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Co-authored-by: Peter Rothlaender <peter.rothlaender@ginkgo.com>