[C++][Parquet] Spaced definition levels is not assigned correctly.

[asfimport]

The existing code assumes that there is only a single repeated parent.  Code needs to backtrack until null or or a repeated parent.  Unfortunately without ability to read path that can read mixed struct/repeated values we can't fully test the fix.

Reporter: Micah Kornfield / @emkornfield
Assignee: Micah Kornfield / @emkornfield

PRs and other links:

• GitHub Pull Request #7862

_{Note: This issue was originally created as ARROW-9598. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Fixed in PR #7862