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Ensure root level hooks are called when running in watch mode

## Rationale
Tests with root level hooks are ignored when running in watch mode.
This occurs on initial & subsequent runs.

## Changes

- updated `lib/cli/run-watch` to re-initialise rootHooks

As we have swapped out the root suite it is necessary to re-initialize
root level hooks again.

- Extended integration tests for watch to take into consideration
  hooks

## Refs

- mochajs/mocha/issues/4347

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