Auto merge of #21170 - gterzian:use_remote_event_task_source_for_eventsource, r=jdm

Use remote-event task source in EventSource

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Follow up on https://github.com/servo/servo/pull/21126, this again 'changes nothing', but will be useful for https://github.com/servo/servo/issues/21114 in the context of https://github.com/servo/servo/pull/21111.

Trying to break up work into smaller PR's ;)

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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #21112 (github issue number if applicable).

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