[REMOVAL] Remove build option WITH_DEPRECATED_SDK_FACTORY #2716
Description
CMake option WITH_DEPRECATED_SDK_FACTORY was introduced in opentelemetry-cpp 1.16.0.
This option is temporary, and used to avoid application code changes when upgrading to 1.16.0, to facilitate upgrade.
Remove option WITH_DEPRECATED_SDK_FACTORY for the next release.
Code currently using WITH_DEPRECATED_SDK_FACTORY=OFF is ready and not affected.
Code still using WITH_DEPRECATED_SDK_FACTORY=ON in release 1.16.0 will not build in 1.17.0. It must be fixed before upgrading to the next release.