Update test_incremental_microbatch to use behavior flag instead of environment variable #21426

Job	Run time
code-quality	1m 5s
unit test / python 3.9	1m 15s
build packages	13s
unit test / python 3.10	1m 12s
unit test / python 3.11	1m 9s
unit test / python 3.12	1m 19s
verify packages / python 3.9 / ubuntu-latest / whl	37s
verify packages / python 3.9 / ubuntu-latest / gz	33s
verify packages / python 3.10 / ubuntu-latest / whl	27s
verify packages / python 3.10 / ubuntu-latest / gz	36s
verify packages / python 3.11 / ubuntu-latest / whl	33s
verify packages / python 3.11 / ubuntu-latest / gz	33s
verify packages / python 3.12 / ubuntu-latest / whl	41s
verify packages / python 3.12 / ubuntu-latest / gz	43s
verify packages / python 3.9 / macos-12 / whl	42s
verify packages / python 3.9 / macos-12 / gz	41s
verify packages / python 3.10 / macos-12 / whl	41s
verify packages / python 3.10 / macos-12 / gz	46s
verify packages / python 3.11 / macos-12 / whl	50s
verify packages / python 3.11 / macos-12 / gz	39s
verify packages / python 3.12 / macos-12 / whl	1m 3s
verify packages / python 3.12 / macos-12 / gz	57s
verify packages / python 3.9 / windows-latest / whl	1m 46s
verify packages / python 3.9 / windows-latest / gz	1m 26s
verify packages / python 3.10 / windows-latest / whl	2m 21s
verify packages / python 3.10 / windows-latest / gz	1m 43s
verify packages / python 3.11 / windows-latest / whl	1m 59s
verify packages / python 3.11 / windows-latest / gz	2m 13s
verify packages / python 3.12 / windows-latest / whl	1m 28s
verify packages / python 3.12 / windows-latest / gz	2m 17s
	32m 28s

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