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Collect test files later (#3953)

This commit prepares improvements to the watch mode behavior. In the future
we want Mocha in watch mode to pick up new test files. This requires
that the test files are collected inside `watchRun` instead of before.

To accomplish this change we rename `handleFiles` to `collectFiles` and
move it to its own module. Instead of calling `collectFiles` in
`lib/cli/run` and passing the files on to `watchRun` or `singleRun` we
pass down the file collection parameters through `runMocha` and call
`collectFiles` in both `watchRun` and `singleRun`.

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