Jetpack Feature Support: Refactor logic between simple/atomic and self-hosted

As suggested here: p1703171672294019/1703070004.603959-slack-C05PV073SG3, we want to check ways to unify logic of whether to show the feature or not. Currently, we need to have multiple checks like `is_wpcom_simple`. Instead, we want to investigate ways to rely solely on functions like `Current_Plan::supports` that will reduce complexity and reduce the amount of possible errors.
```[tasklist]
### Tasks
- [ ] https://github.com/Automattic/jetpack/issues/34762
```