Revert "feat: add video generation core infrastructure and extend image generation parameters (#53681)" (#54943)

This reverts commit 4cb8dde894.

src/plugin-sdk/video-generation.ts

@@ -1,10 +0,0 @@
-// Public video-generation helpers and types for provider plugins.
-
-export type {
-  GeneratedVideoAsset,
-  VideoGenerationProvider,
-  VideoGenerationProviderCapabilities,
-  VideoGenerationRequest,
-  VideoGenerationResult,
-  VideoGenerationSourceImage,
-} from "../video-generation/types.js";