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GH-34962: [Go] Make GetOneForMarshal public on Array interface (#34964)



### Rationale for this change

### What changes are included in this PR?

### Are these changes tested?

### Are there any user-facing changes?

* Closes: #34962

Authored-by: Yevgeny Pats <16490766+yevgenypats@users.noreply.github.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>