Remove backend_debug from torch_core srcs and replace with library dependency (#63111)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63111
### Problem:
Buck contains at least two libraries which have `backend_debug_info.cpp` as a source, `torch_core` and `backend_interface_lib`. `backend_debug_info.cpp` registers BackendDebugInfo as a class. If targets contain both libraries (e.g. sparkAR debug build with NNAPI delegation), then BackendDebugInfo is registered twice, causing a runtime error.
### Solution:
These changes remove `backend_debug_info.cpp` and `backend_interface.cpp` as a source in `torch_core` and adds backend_interface_lib as a dependency instead.
**build_variables.bzl:**
- Added a list that excludes `backend_debug_info.cpp` and `backend_interface.cpp` ( both srcs already included by `backend_interface_lib`)
**buck:**
- torch_core: Removed `backend_debug_info.cpp` from srcs and added `backend_interface_lib` deps
- backend_interface_lib: Replaced `torch_mobile_core` dep with more specific deps
- to avoid an indirect dep between `torch_core` and `torch_mobile_core`
ghstack-source-id: 135981061
Test Plan:
### Test Plan:
Build and run SparkAR internally with Android NNAPI Delegation (`buck build --show-output arstudioplayer_arm64_debug`)
and internal tests.
Reviewed By: iseeyuan
Differential Revision: D30259034
fbshipit-source-id: 0c14c827732f07fb9b9bd25a999828b51793cdcc
