Remove pre_build_script from windows conda build

[NicolasHug]

pre-build-script should be only be used for wheel builds

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8590

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:x: 8 New Failures

As of commit be2286da5a1774545eea79efcf61794845f5838c with merge base 8f73afacb81df1fcc6e2d308c5b734b126db3426 ():

NEW FAILURES - The following jobs have failed:

* [Build Aarch64 Linux Wheels / pytorch/vision / upload / wheel-py3_9-cpu-aarch64](https://hud.pytorch.org/pr/pytorch/vision/8590#28764898491) ([gh](https://github.com/pytorch/vision/actions/runs/10388572254/job/28764898491)) `Unable to find any artifacts for the associated workflow` * [Build Aarch64 Linux Wheels / pytorch/vision / upload / wheel-py3_9-cuda-aarch64cuda-aarch64](https://hud.pytorch.org/pr/pytorch/vision/8590#28764898859) ([gh](https://github.com/pytorch/vision/actions/runs/10388572254/job/28764898859)) `Unable to find any artifacts for the associated workflow` * [CMake / windows (windows.4xlarge, cpu) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28764517951) ([gh](https://github.com/pytorch/vision/actions/runs/10388572241/job/28764517951)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128` * [Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28765932731) ([gh](https://github.com/pytorch/vision/actions/runs/10388572239/job/28765932731)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128` * [Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28765933111) ([gh](https://github.com/pytorch/vision/actions/runs/10388572239/job/28765933111)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128` * [Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28765933500) ([gh](https://github.com/pytorch/vision/actions/runs/10388572239/job/28765933500)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128` * [Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28765933888) ([gh](https://github.com/pytorch/vision/actions/runs/10388572239/job/28765933888)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128` * [Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job](https://hud.pytorch.org/pr/pytorch/vision/8590#28765934338) ([gh](https://github.com/pytorch/vision/actions/runs/10388572239/job/28765934338)) `The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128`

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