[cleanup] Remove unused package jest-mock-scheduler (#26084)

## Summary Removing package jest-mock-scheduler introduced in PR #14358, as it is no longer referenced in the main branch code. The following files previously referenced it: - packages/scheduler/src/__tests__/Scheduler-test.js - packages/scheduler/src/__tests__/SchedulerDOM-test.js - packages/shared/__tests__/ReactDOMFrameScheduling-test.js - scripts/jest/setupTests.js - scripts/rollup/bundles.js ## How did you test this change? ci green
facebook · Jan 31, 2023 · d7bb524 · d7bb524
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diff --git a/packages/jest-mock-scheduler/README.md b/packages/jest-mock-scheduler/README.md
diff --git a/packages/jest-mock-scheduler/npm/index.js b/packages/jest-mock-scheduler/npm/index.js
diff --git a/packages/jest-mock-scheduler/package.json b/packages/jest-mock-scheduler/package.json