feat: Remove mock fetch from mocks. (#525)

This was not used and had hidden global state which would have caused
confusion if used.

I also removed fetchFlags because it was unused and will be replaced
with a used version in from the polling feature branch.

Author: kinyoklion

packages/shared/mocks/src/index.ts

@@ -3,15 +3,13 @@ import ContextDeduplicator from './contextDeduplicator';
 import { hasher } from './crypto';
 import { MockEventProcessor, setupMockEventProcessor } from './eventProcessor';
 import logger from './logger';
-import mockFetch from './mockFetch';
 import { basicPlatform } from './platform';
 import { MockStreamingProcessor, setupMockStreamingProcessor } from './streamingProcessor';
 
 export {
   basicPlatform,
   clientContext,
   hasher,
-  mockFetch,
   logger,
   ContextDeduplicator,
   MockEventProcessor,