Summary:
Unlike PG, YB creates storage (a DocDB table) (see GH issue #6525) and a relfilenode (see commit 9c8ae9628fa5ab401d5958074729d1fab173b55f) for parent partitioned tables.
This revision changes binary upgrade code-paths to preserve the relfilenode for parent tables.
Jira: DB-14551

Test Plan: ./yb_build.sh release --cxx-test pg15_upgrade-test --gtest_filter Pg15UpgradeTest.PartitionedTables

Reviewers: myang

Reviewed By: myang

Subscribers: smishra, yql

Differential Revision: https://phorge.dev.yugabyte.com/D41219