- Simplified and streamlined logic for merging fields and resolving overwrite/extend conflicts.
- Improved support for merging dictionaries and extending lists in `add_fields_to`.
- Added tests to validate new behaviors and handle edge cases more effectively.

- Replaced `extend_target_list` with `merge_with_target` across processors and utilities for clarity and better functionality.
- Ensured proper handling of scenarios where merging and overwriting targets could conflict.

- Ensures all values in the `prefixed_label` dictionary are lists.
- Adds a unit test to validate the behavior for labeler rules.

- moves test at the end of the list

- Simplifies conditional branches by reordering merge cases.
- Streamlines how source values and targets are handled.
- Ensures proper handling of dict merging and overwrite flags.

- Introduced a new test case to validate merging response data with an existing dictionary.
- Ensures proper behavior when "merge_with_target" is enabled in the requester configuration.