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Warn that suites cannot return a value (#3550)

* Give a `DeprecationWarning` on suite callback returning any value.
* Deprecation warning: Show a message only once; use `process.nextTick` when falling back to `console.warn`
* Add a test for `utils.deprecate`
* style: Make prettier happy
* test(deprecate.spec.js): Make PR requested changes for approval (per @boneskull)

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