Merge job-spec env variables of Pytorch/Caffe2 CI jobs (#16649)
Summary:
The idea is to unify the environment variables `JOB_BASE_NAME` and `BUILD_ENVIRONMENT` which controlled the Pytorch and Caffe2 jobs respectively. In this commit, we have converted all the `JOB_BASE_NAME` references in _.jenkins/pytorch/*_ files to `BUILD_ENVIRONMENT`. Then, did the same thing in ._circleci/config.yml_. One thing that we needed to be careful was when both `BUILD_ENVIRONMENT `and `JOB_BASE_NAME` were present under same declaration in _config.yml_ file (e.g., for "caffe2-" stuffs). To ensure that all "==" checks work as expected, we also had to add "*" in some if conditions in _.jenkins/caffe2/build.sh_ file. Finally, removed "-build", "-test", etc. suffixes from `COMPACT_JOB_NAME` variable assignment in the bash script files in _.jenkins/pytorch_ folder, e.g., modify `COMPACT_JOB_NAME="${BUILD_ENVIRONMENT}-build"` to `COMPACT_JOB_NAME="${BUILD_ENVIRONMENT}"`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16649
Differential Revision: D13946392
Pulled By: mmh683
fbshipit-source-id: 790de6abf96de184758e395c9098a50998e05bc5
