fixed CMake Error at src/CMakeLists.txt:159 (install): install TARGET…

### Issue Description The CMake configuration process fails due to a non-existent target `Sync` being included in `INSTALL_TARGETS` when `REALM_ENABLE_SYNC=OFF`. The target `Sync` should only be appended to `INSTALL_TARGETS` if synchronization is enabled. ### Repro Steps 1. Configure the build with the following options: ``` cmake -B build . \ -D CMAKE_BUILD_TYPE=Release \ -D REALM_ENABLE_SYNC=OFF ``` ### What Happened? The build fails with the following error: ``` CMake Error at src/CMakeLists.txt:159 (install): install TARGETS given target "Sync" which does not exist. ``` The target `Sync` is being appended to `INSTALL_TARGETS` unconditionally, without checking if it has been created. When `REALM_ENABLE_SYNC=OFF`, the `Sync` target is not defined, causing the error during the installation phase. ### Fix Proposal Update the `src/CMakeLists.txt` to conditionally append the `Sync` target only if it has been created. The following changes are required: ``` set(INSTALL_TARGETS ObjectStore Storage QueryParser) if (REALM_ENABLE_SYNC) list(APPEND INSTALL_TARGETS Sync) endif() ``` This ensures that the `Sync` target is only included when `REALM_ENABLE_SYNC=ON`, avoiding errors during installation when synchronization is disabled. ### Version - Realm C++ version: `2.2.0` - Installation method: `CMake` ### Atlas Services in Use - Local Database only ### Compiler - AppleClang 16.0.0.16000026 ### OS and Version - Sequoia 15.1 ### Code Snippets Relevant code snippet causing the issue: `set(INSTALL_TARGETS ObjectStore Storage QueryParser Sync)` ### Stacktrace of the Exception/Crash CMake Error at src/CMakeLists.txt:159 (install): install TARGETS given target "Sync" which does not exist. ### Relevant Log Output No additional log output provided.