Jv/kinesis fix flush strategy naming #91

Job	Run time
test / test-dart-vm (stable)	1m 55s
test / test-dart-vm (3.9.0)	1m 41s
native_test / test-dart-native (macos-14)	1m 13s
native_test / test-dart-native (windows-latest)	3m 33s
	8m 22s

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