text: Title: [Telemetry] Enforce use of `import type` and `export type`
  Body: Let's use `import/export type` where it applies. This is recommended for better bundle size, but also for not publicly exposing classes we don't want external services to use (but we still want to share their types).
  
  - [x] packages/kbn-analytics/**
  - [x] packages/kbn-telemetry-tools/**
  - [x] src/plugins/kibana_usage_collection/**
  - [x] src/plugins/usage_collection/**
  - [x] src/plugins/telemetry/**
  - [x] src/plugins/telemetry_collection_manager/**
  - [x] src/plugins/telemetry_management_section/**
  - [x] x-pack/plugins/telemetry_collection_xpack/**
  
  We can do this as a follow-up to #92221