[BUG]: UCX table migration workflow does not preserve column name case

[pritishpai]

Changes

Test column case preservation during migration

Linked issues

Resolves #2218

Functionality

• [ ] added relevant user documentation
• [ ] added new CLI command
• [ ] modified existing command: databricks labs ucx ...
• [ ] added a new workflow
• [ ] modified existing workflow: ...
• [ ] added a new table
• [ ] modified existing table: ...

Tests

• [ ] manually tested
• [ ] added unit tests
• [x] added integration tests
• [ ] verified on staging environment (screenshot attached)