Enhancement: improve dashboard when search is disabled in Jetpack Complete

### Impacted plugin

Search

### What

Improve disabling Search for Jetpack Complete

### How

Jetpack Complete plan is limited to 100k records and requests per month. Once the limits are exceeded for 3 months, site receives `jetpack_search_complete_disabled` sticker, and their search no longer works. However, it's not explained in the search dashboard.

I attempted to create an enhancement for that in https://github.com/Automattic/jetpack/pull/28115, but I think it needs a further refinement. The user can have Search enabled while being after the limits, and they wouldn't be able to disable the instant search.

See also internal thread: panfyZ-1wq-p2#comment-3810