[CI][Java] Remove CI scripts for Java

[hiroyuki-sato]

Describe the enhancement requested

Scripts in CI were used for Java, but Java was moved to a separate repository, so the scripts are no longer needed.

ci/scripts/java_build.sh
ci/scripts/java_cdata_integration.sh
ci/scripts/java_full_build.sh
ci/scripts/java_jni_build.sh
ci/scripts/java_jni_macos_build.sh
ci/scripts/java_jni_manylinux_build.sh
ci/scripts/java_jni_windows_build.sh
ci/scripts/java_test.sh

Component(s)

Continuous Integration

[hiroyuki-sato]

@kou Can we remove all of files?

ci/scripts/java_build.sh
ci/scripts/java_cdata_integration.sh
ci/scripts/java_full_build.sh
ci/scripts/java_jni_build.sh
ci/scripts/java_jni_macos_build.sh
ci/scripts/java_jni_manylinux_build.sh
ci/scripts/java_jni_windows_build.sh
ci/scripts/java_test.sh

[kou]

Issue resolved by pull request 46502
#46502