Fallback Values - UX Improvements

New functionality and UX for fallback values:

1. Added a button to explicitly remove fallback values (previously you needed to reset the data type)

2. If your property is set to mapped data (JSON Path) you can now set a fallback to no value

   1. When you use this no value option the property is not included in the output of the step

   2. You can still set the fallback to an empty string by clicking into the field and then clicking out - you will see the placeholder text changes from "no value" to "empty string" when you do this

   3. There is no change in functionality for interpolation jsonpaths in text inputs as these fallback to an empty string

For detailed information, please refer to the feature's documentation.