Handle out of order disconnects and reconnects.

[justtonytone]

• Update dwds to support ignoring disconnects for the SseHandler
• This is useful to prevent incorrect behavior when a disconnect event arrives after a new connection request

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[justtonytone]

Requires dart-lang/tools#2305

[justtonytone]

I would've expected this to fail since sse is only on 4.1.8, is there some kind of presubmit here that tries to run a build?

[bkonyi]

Yes, but we need to approve the workflows to run since you're not a trusted contributor on the repository. They'd definitely fail :)