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GH-33626: [Packaging][RPM] Don't remove metadata for non-target arch (#33672)

# Which issue does this PR close?

Closes #33626

# Rationale for this change

ADBC reuses dev/release/05-binary-upload.sh for its RPM packages. ADBC only provides x86_64 packages. ADBC doesn't provide aarch64 packages for now.

In this situation, ADBC release deletes Yum repository metadata for aarch64 unexpectedly. dev/release/05-binary-upload.sh should not touch Yum repository metadata for aarch64 in ADBC release.

# What changes are included in this PR?

Copy Yum repository metadata for non-target architecture as-is.

# Are these changes tested?

Yes.

# Are there any user-facing changes?

No.
* Closes: #33626

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