GH-492: [CI] Remove java_ prefix from ci/scripts/*.sh

Fixes GH-492.

Author: kou

ci/scripts/java_build.sh renamed to ci/scripts/build.sh

@@ -45,8 +45,8 @@ services:
       - ${DOCKER_VOLUME_PREFIX}maven-cache:/root/.m2:delegated
     command:
       /bin/bash -c "
-        /arrow-java/ci/scripts/java_build.sh /arrow-java /build &&
-        /arrow-java/ci/scripts/java_test.sh /arrow-java /build"
+        /arrow-java/ci/scripts/build.sh /arrow-java /build &&
+        /arrow-java/ci/scripts/test.sh /arrow-java /build"
 
   conda-jni-cdata:
     # Builds and tests just the C Data Interface JNI library and JARs.
@@ -79,8 +79,8 @@ services:
     command:
       /bin/bash -c "
         /arrow-java/ci/scripts/jni_build.sh /arrow-java /build/jni /build /jni &&
-        /arrow-java/ci/scripts/java_build.sh /arrow-java /build /jni &&
-        /arrow-java/ci/scripts/java_test.sh /arrow-java /build /jni"
+        /arrow-java/ci/scripts/build.sh /arrow-java /build /jni &&
+        /arrow-java/ci/scripts/test.sh /arrow-java /build /jni"
 
   vcpkg-jni:
     # Builds all the JNI libraries, but not the JARs.