ui: remove react-ace dependency

[miguelgrc]

Feature request

• Once we migrate to antd and get rid of the grommet code, remove the react-ace dependency.
• Maybe even remove jsondiffpatch if we decide to go with @codemirror/merge for that (although it's in version 0.0.1, so depending on when we tackle this it could make more or less sense).

What is the expected behavior? The react-ace dependency should be removed

What is motivation or use case for adding/changing the behavior? No need for it once we totally migrate to antd and codemirror

How should this be implemented in your opinion? yarn remove react-ace

Are you willing to work on this yourself? yes

[miguelgrc]

• react-ace removed in #2775.
• jsondiffpatch replaced in #2772.

Note that the react-ace dependency is still used by forms-playground. It will be removed from there when the subproject is updated in general (we'll have a big task for that eventually).