[Bug]: some parallel branches may not be included in the ParallelResult when MIN_SUCCESSFUL_REACHED is returned

[zhongkechen]

Expected Behavior

All branches should be included in the ParallelResult no matter they're executed or not.

Actual Behavior

Some parallel branches may not be included in the ParallelResult when MIN_SUCCESSFUL_REACHED is returned.

Steps to Reproduce

run test case testParallelWithFirstSuccessful_earlyTermination. Its result may not include some branches sometimes.

aws-durable-execution-sdk-java/sdk-integration-tests/src/test/java/software/amazon/lambda/durable/ParallelIntegrationTest.java

Lines 1058 to 1060 in a89bc26

	// todo: the result is constructed when handling parallel completion,
	// which might be earlier than the last branch is added.
	assertTrue(result.size() <= 3);

SDK Version

1.0.0

Java Version

17

Is this a regression?

No

Last Working Version

No response

Additional Context

No response