A distributor such as ntfy or DAVx5 lists every registration it holds, but
Element registered each one with no message for the distributor, so an
account added from a second session was indistinguishable from the first.
RegisterUnifiedPushUseCase.execute now takes the session id and passes it
as messageForDistributor, which the connector has accepted since 3.x. The
value is the raw Matrix ID, which is not personal data by the project's
own logging rules, and no new string resource is needed.
UnifiedPushProvider already has the MatrixClient in hand at the only call
site, so the PushProvider interface is unchanged and nothing outside the
module moves.
Relates to https://github.com/element-hq/element-x-android/issues/6426
hayaksi1
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