refactor(schema-registry): align list with topic/security listings

- Replace legacy Section box with ListLayout scaffolding so the table
  renders flush like the topics/security lists
- Add faceted Type and Compatibility filters (DataTableFacetedFilter)
- Move the row delete action into a three-dots kebab menu
- Use shared DataTablePagination
- Load all subject details up front (useSchemaDetailsByNameQuery, shared
  cache) to enable list-wide type/compatibility filtering
- Update schema e2e helpers/spec for the new kebab delete flow

Author: jvorcak