Remove unneeded packaging files (#3618)

* remove some files

* Also remove entire packaging/conda folder
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

packaging/windows/templates/upload_to_s3.yml

-parameters:
-  cuVer: ''
-  cudaVer: ''
-
-steps:
-- task: AmazonWebServices.aws-vsts-tools.S3Upload.S3Upload@1
-  displayName: 'Upload ${{ parameters.cuVer }} wheel to S3'
-  inputs:
-    awsCredentials: 'Pytorch S3 bucket'
-    bucketName: 'pytorch'
-    sourceFolder: 'packaging/windows/output'
-    globExpressions: '*.whl'
-    targetFolder: 'whl/nightly/${{ parameters.cuVer }}/'
-    filesAcl: 'public-read'
-    flattenFolders: 'true'

packaging/windows/templates/vsts_auth.yml

-parameters:
-  auth: ''
-
-steps:
-- script: 'call packaging/windows/internal/auth.bat'
-  displayName: 'Sign in to Azure Pipelines'
-  env:
-    VSTS_AUTH: ${{ parameters.auth }}