Mapping panel improvements

As a user, I want to search in a column in the target columns. (Advanced search is not part of this story - ) I am able to unmap all mapping by the "Unmap all" button. This is a context action so if I find only some columns, it should unmap only displayed columns. (the Automap functionality is not part of this story - ).

Undo/redo functionality works for unmap all functionality.

Designs

https://www.figma.com/file/xYebkVqwHssFJnOBG2LlCR/Wrangler?type=design&node-id=9664-480706&mode=dev

Acceptance criteria

• Search functionality

• Unmap all functionality

• JS tests