[sdk-platform-java] Regenerate clirr-ignored-differences.xml in library generation #12414
Description
Currently, the clirr-ignored-differences.xml is only generated if the file doesn't exist, e.g., in new client generation.
We should make this file as one of the output of the library generation, i.e., regenerate it even if it exists.
Note that handwritten libraries may have customizations in this file so we need to keep them after the regeneration.