[BE] Migration of Builder Repository to pytorch/pytorch and pytorch/test-infra repository

[atalman]

Our Nightly and Release pipeline spread over 3 repositories: pytorch/pytorch, pytorch/builder and pytorch/test-infra .This creates maintenance overhead and following issues:

• Builder Repo Changes are not getting tested by PyTorch CI on PR. To test these changes developer need to open special PR against Pytorch/Pytorch poining to his builder fork. This makes it extremely difficult to test changes to builder repo
• Changes to Docker builds can't be tested.
• During Pytorch Release process we perform branch cut and cherry-picking to builder repo, not only pytorch/pytorch

Hence to solve these issues we are working on Moving all Build and Test Scripts for pytorch binary to pytorch/pytorch
All Validation and analytics scripts to pytorch/test-infra repository.

Following Work Has been Completed:

• Migrate Docker builds Migrate conda, manywheel and libtorch docker builds to pytorch/pytorch pytorch#129022
• Move Magma builds f Replace magma-cuda dependency on pytorch/conda-builder Docker image  pytorch#138909 Build magma for windows pytorch#139924 Replace magma-cuda dependency on pytorch/conda-builder Docker image  pytorch#138909
• Move manywheel binary scripts to pytorch pytorch#138103
• Move Windows build scripts Migrate windows build scripts from builder to pytorch pytorch#142156
• Removal of Anaconda build scripts Delete conda build scripts - 2 #2045 Remove windows conda build script #2047 Delete conda build scripts #2041
• Migration of smoke test scripts to pytorch/pytorch Migrate smoke tests to pytorch/pytorch pytorch#142482
• Migration of most of validation framework to pytorh/test-infra https://github.com/pytorch/test-infra/pull/6029/files
• Add check_binary workflow to pytorch/pytorch pytorch#143201
• Remove dependency on builder since these workflows are moved to test-infra pytorch.github.io#1858
• Deprecate builder scripts Remove validation framework scripts and check_binary.sh #2055
• Remove builder repo from workflows and scripts pytorch#143776
• Revise RELEASE.md pytorch file
• Revise CUDA_UDPATE guide
• Migration of analytics and release scripts to pytorch/test-infra

Please note: If you intend to add or modify PyTorch build or test scripts please do it directly in pytorch/pytorch repository