[SYCL][UR] Add Windows debug libs to install target (#17512)
1. Add install target for Windows debug libs called
`install-unified-runtime-libraries` which installs only the runtime
library subset of targets. This can be used to provide `ur_loaderd.dll`
and `ur_adatper_<name>d.dll` which link against the multithreaded debug
DLL C runtime by using the `DEBUG_POSTFIX` target property to append `d`
to the library names.
2. Add `UR_USE_DEBUG_POSTFIX` option to enable adding the `d` suffix to
library names.
3. Remove setting redundant `OUTPUT_NAME`s as combining
`DEBUG_POSTFIX=d` and then setting
`LIBRARY_OUTPUT_NAME`/`RUNTIME_OUTPUT_NAME` exposes a bug in CMake where
the `DEBUG_POSTFIX` is ignored for the `ur_loader.dll`. Removing these
redundant property setters fixed the previous issue.
4. Add debug UR subbuild on Windows `ExternalProject` compiled in debug
mode and with the `UR_USE_DEBUG_POSTFIX` option enabled.
* The resulting libraries are then copied to the
`<build>/bin`/`<build>/lib` directories so they can be used in testing
(not yet implemented).
* Additionally, they are also included in the `deploy-sycl-toolchain`
install target alongside the normally named runtime libraries.
5. Update `ur_proxy_loaderd.dll` to use Windows debug libs
