Replaces the “Add Policies” picker with a modal table (search, pagination, multi-select).
Adds filters: policy type, platform, last synced, ignored, has versions; “Select all” applies to the current filtered results.
Improves identifiers shown (short external id), and fixes has-versions filtering behavior.
Backup set items table: groups row actions (View policy / Remove) into an action group.
Adds bulk action to remove multiple backup items at once.
Updates/adds tests covering the picker table bulk add and backup items bulk remove.
Co-authored-by: Ahmed Darrazi <ahmeddarrazi@adsmac.local>
Reviewed-on: #21
