Fix usage of plain metadata type with new disks configuration option

[kssenii]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix usage of plain metadata type for new disks configuration option.

[robot-ch-test-poll1]

This is an automated comment for commit c947484 with description of existing statuses. It's updated for the latest CI running

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[jkartseva]

I'll rebase #61116 on top of this branch.

[kssenii]

Integration tests (tsan) [3/6] — fail: 1

test_storage_azure_blob_storage/test.py::test_union_schema_inference_mode

Stateless tests (tsan, s3 storage) [1/5] — fail: 1

02784_parallel_replicas_automatic_decision_join

A Sync — Private CI has failed

In fact the sync PR is green and all tests passed, the check result update was not triggered.