[w3c/ServiceWorker] Spec FetchEvent.resultingClientId/targetClientId (#1245)

We decided to [not expose reserved client](https://github.com/w3c/ServiceWorker/issues/1216) that closed #1228 #1215 #1123 #1078 #1035 #1034 #1031 #1030.

V1 removes the related web exposed features:
- `Client.reserved`
- `ClientQueryOptions.includeReserved`
- `FetchEvent.reservedClientId`
- `FetchEvent.targetClientId`
- `FetchEventInit.reservedClientId`
- `FetchEventInit.targetClientId`

V2 will spec `FetchEvent.resultingClientId`, `FetchEvent.targetClientId`, and the underlying behavior including the excusion ready flag.

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