Use same .clang-format in cuDF JNI (#15557)

Closes #15546.

Currently cuDF JNI uses its own `.clang-format` settings. These settings organize includes differently than the rest of the cuDF C++ codebase, so we would like to align them.

This PR removes the JNI's custom `.clang-format` and instead uses the same settings as the rest of cuDF.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Nghia Truong (https://github.com/ttnghia)
  - Mark Harris (https://github.com/harrism)

URL: #15557