Deduplicate ElectronApplication declaration in generated type sources

[Copilot]

ElectronApplication was being exported twice in generated types.d.ts files because utils/generate_types/overrides.d.ts defined it twice. This caused duplicated interface output in both core and client type bundles.

• Root cause

  • utils/generate_types/overrides.d.ts contained two identical blocks:
    • type ElectronType = typeof import('electron')
    • export interface ElectronApplication { ... }

• Change made

  • Removed the second duplicated ElectronType + ElectronApplication block from utils/generate_types/overrides.d.ts.

• Generated output impact

  • Regenerated declarations now contain a single ElectronApplication definition in:
    • packages/playwright-core/types/types.d.ts
    • packages/playwright-client/types/types.d.ts

• Before/after (source override)

  // kept (single source of truth)
  //@ts-ignore this will be any if electron is not installed
  type ElectronType = typeof import('electron');
  
  export interface ElectronApplication {
    evaluate<R, Arg>(pageFunction: PageFunctionOn<ElectronType, Arg, R>, arg: Arg): Promise<R>;
    evaluate<R>(pageFunction: PageFunctionOn<ElectronType, void, R>, arg?: any): Promise<R>;
    evaluateHandle<R, Arg>(pageFunction: PageFunctionOn<ElectronType, Arg, R>, arg: Arg): Promise<SmartHandle<R>>;
    evaluateHandle<R>(pageFunction: PageFunctionOn<ElectronType, void, R>, arg?: any): Promise<SmartHandle<R>>;
  }
  
  // removed: identical duplicate block near file end