[w3c/ServiceWorker] `Clients.matchAll()` should exclude the current environment (#1037)

With #1036 and #955 we create the possibility to use `Clients.matchAll()` in a way that would match the currently executing environment.  This would probably be surprising to callers.  I think we should exclude the "self" environment automatically.  If developers end up wanting it for some reason we could add a `includeSelf:true` option in the future.

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