Verify that the behavior flag warning fires once (#916) #7391

Job	Run time
code-quality	10s
unit test / python 3.8	13s
unit test / python 3.9	52s
unit test / python 3.10	56s
build packages	20s
unit test / python 3.11	42s
unit test / python 3.12	56s
verify packages / python 3.8 / ubuntu-22.04	41s
verify packages / python 3.9 / ubuntu-22.04	36s
verify packages / python 3.10 / ubuntu-22.04	39s
verify packages / python 3.11 / ubuntu-22.04	34s
verify packages / python 3.12 / ubuntu-22.04	42s
verify packages / python 3.8 / macos-12	1m 1s
verify packages / python 3.9 / macos-12	54s
verify packages / python 3.10 / macos-12	51s
verify packages / python 3.11 / macos-12	1m 1s
verify packages / python 3.12 / macos-12	54s
verify packages / python 3.8 / windows-2022	1m 4s
verify packages / python 3.9 / windows-2022	1m 23s
verify packages / python 3.10 / windows-2022	2m 3s
verify packages / python 3.11 / windows-2022	1m 31s
verify packages / python 3.12 / windows-2022	1m 49s
	19m 52s

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