Properly dispose of events in combineIterators() (Locators.iterEnvs()). (#15352)
Properly dispose of events in combineIterators() (Locators.iterEnvs()). (#15352)

The actual fix is in combineIterators().

Note that we also were not disposing of the event emitter in combineIterators(). This change removes the emitter, so it's a moot point.
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