OSS - Task annotations - Allow having different UI and annotations in OSS and Shopify

In future, a set of possible annotations and their values can come from backend (e.g. as JsonSchema) and be per-cloud.

We can start with a JSON file describing the known annotations, their value types etc. This file can be overridden in the internal deployment to add more annotations.

We can later move to a system where the backend returns that file (ideally, in JsonSchema form).