[BE] Don't build CUDA-10.2 docker images (#87819)

As CUDA-10.2 should not longer be used in CI/CD

Test Plan: ` grep cuda10.2 .github -R|grep -v mock`

Pull Request resolved: #87819
Approved by: https://github.com/kit1980, https://github.com/ZainRizvi

.github/workflows/docker-builds.yml

@@ -33,7 +33,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - docker-image-name: pytorch-linux-bionic-cuda10.2-cudnn7-py3.9-gcc7
           - docker-image-name: pytorch-linux-bionic-cuda11.3-cudnn8-py3-clang9
           - docker-image-name: pytorch-linux-bionic-cuda11.6-cudnn8-py3-gcc7
           - docker-image-name: pytorch-linux-bionic-cuda11.7-cudnn8-py3-gcc7
@@ -42,7 +41,6 @@ jobs:
           - docker-image-name: pytorch-linux-focal-rocm5.2-py3.8
           - docker-image-name: pytorch-linux-jammy-cuda11.6-cudnn8-py3.8-clang12
           - docker-image-name: pytorch-linux-jammy-cuda11.7-cudnn8-py3.8-clang12
-          - docker-image-name: pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7
           - docker-image-name: pytorch-linux-xenial-cuda11.3-cudnn8-py3-gcc7
           - docker-image-name: pytorch-linux-xenial-py3-clang5-android-ndk-r19c
           - docker-image-name: pytorch-linux-xenial-py3-clang5-asan