fix: add replay_children in checkpoint processor #395

Job	Run time
setup	5s
Step with Name	58s
Step with Retry	1m 11s
Hello World	1m 5s
Basic Step	57s
Callback	1m 3s
Wait State	1m 5s
Wait for Callback Success	58s
Wait for Callback Failure	56s
Map Operations	1m 4s
Multiple Wait	1m 9s
Block Example	1m 1s
Wait for Condition	54s
Logger Example	1m 5s
Steps with Retry	1m 14s
Parallel Operations	1m 0s
Map Large Scale	1m 13s
Run in Child Context	57s
Map with Max Concurrency	55s
Parallel with Failure Tolerance	54s
Map with Failure Tolerance	1m 3s
Simple Execution	56s
Parallel with Max Concurrency	53s
Run in Child Context Large Data	1m 2s
Parallel with Wait	1m 2s
Parallel with Custom SerDes	58s
Map with Custom SerDes	1m 3s
Parallel with Batch SerDes	1m 10s
Handler Error	52s
Map with Batch SerDes	1m 8s
Map with Min Successful	1m 1s
	30m 52s

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