Add tests for chowns after file migration

[bepri]

What needs to get done

Currently, there aren't any tests validating that file ownership is correct after the file migration step. This test should be added.

Why it needs to get done

Spawned by the following TODO comment:

craft-parts/tests/unit/executor/test_migration.py

Line 360 in bff2fa0

# TODO: add test_migrate_files_preserves_file_mode_chown_permissions # noqa: FIX002

[lengau]

In general we should be checking the metadata.

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-4822.

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