Remove Java21InputAstVisitor until JDK 21 is used am: 78fb69ff70 am: be4a1e47fe am: e184bb3da3

Original change: https://android-review.googlesource.com/c/platform/external/google-java-format/+/2890339

Change-Id: I4f19c38fa9b46b257e5e5759268575aea1363932
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>