* Add onboarding task status API endpoint.
* Add task status to onboarding data store.
* Update appearance task to use onboarding store for status info.
* Update main task list component to use onboarding data store for status info.
* Clear onboarding status info "cache" when setting shipping rates in the task list.
* Clear onboarding status info "cache" when enabling payment methods from the task list.
* Fix onboarding data store reducer tests.
* Clean up redundant code, nest task status settings under new key for hydration.
* Include tasks status in onboarding data hydration.
* Update tax task to use onboarding data store for status info.
* Avoid continually rehydrating onboarding data.
* Refactor payment task method retrieval to use onboarding data store.
* Fix bug with disappearing appearance tax steps.
* Update appearance completion faster by using hydrated onboarding value.
* Avoid PHP warnings when onboarding isn't enabled.
* Remove unused imports.
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