fixed failed UI tests

Fixed following tests:
- updated `select_deselect_entity` fn to fix following tests:
   - ` test_update_os_partition_table`
   - ` test_update_os_medium`
-  updated dropdown locator to remove template and it wil fix:
   - `test_remove_configtemplate_1`
   - `test_remove_template`
Fixed assertion for `test_positive_update_2` from repository module