http, timers: remove domain specific code
This PR removes some domain specific code that is no longer necessary due to the changes in semantics of how domains are tracked.
This will need a CitGM run to make sure no one is relying on the current behaviour but the interaction with the actual domain
module remains the same, so hopefully this should be fine.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
http, timers