use "direct" write for non-partitioned python model materializations #21587

Job	Run time
code-quality	59s
build packages	20s
unit test / python 3.9	1m 9s
unit test / python 3.10	1m 10s
unit test / python 3.11	1m 2s
unit test / python 3.12	1m 23s
verify packages / python 3.9 / ubuntu-latest / whl	34s
verify packages / python 3.9 / ubuntu-latest / gz	30s
verify packages / python 3.10 / ubuntu-latest / whl	31s
verify packages / python 3.10 / ubuntu-latest / gz	33s
verify packages / python 3.11 / ubuntu-latest / whl	32s
verify packages / python 3.11 / ubuntu-latest / gz	31s
verify packages / python 3.12 / ubuntu-latest / whl	50s
verify packages / python 3.12 / ubuntu-latest / gz	39s
verify packages / python 3.9 / macos-12 / whl	44s
verify packages / python 3.9 / macos-12 / gz	48s
verify packages / python 3.10 / macos-12 / whl	46s
verify packages / python 3.10 / macos-12 / gz	47s
verify packages / python 3.11 / macos-12 / whl	44s
verify packages / python 3.11 / macos-12 / gz	47s
verify packages / python 3.12 / macos-12 / whl	53s
verify packages / python 3.12 / macos-12 / gz	54s
verify packages / python 3.9 / windows-latest / whl	2m 6s
verify packages / python 3.9 / windows-latest / gz	2m 33s
verify packages / python 3.10 / windows-latest / whl	2m 48s
verify packages / python 3.10 / windows-latest / gz	2m 9s
verify packages / python 3.11 / windows-latest / whl	2m 52s
verify packages / python 3.11 / windows-latest / gz	2m 1s
verify packages / python 3.12 / windows-latest / whl	2m 36s
verify packages / python 3.12 / windows-latest / gz	2m 20s
	36m 31s

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