refactor(core): break plugin host cycle (#38120)

Co-authored-by: James Long <17031+jlongster@users.noreply.github.com>

packages/core/src/plugin/host.ts

@@ -12,7 +12,7 @@ import { EventV2 } from "../event"
 import { Integration } from "../integration"
 import { Location } from "../location"
 import { ModelV2 } from "../model"
-import { PluginV2 } from "../plugin"
+import type { PluginV2 } from "../plugin"
 import { PluginRuntime } from "./runtime"
 import { ProviderV2 } from "../provider"
 import { Reference } from "../reference"