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ARROW-14623: [Packaging][Java] Upload not only .jar but also .pom

.pom files will be needed to publish packages at https://repository.apache.org/#staging-upload .

.jar files are generated at target/ and installed to ~/.m2/repository/org/apache/arrow/.
.pom files are only installed to ~/.m2/repository/org/apache/arrow/.

So this change collects artifacts from ~/.m2/repository/org/apache/arrow/ instead of build directory.

Dist path change (arrow/java/dist -> arrow/java-dist) isn't required but it's better that
we use out of source directory for dist path. It's easy to debug.

Closes #11634 from kou/ci-java-jars-pom

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>