timers: run nextTicks after each immediate and timer

In order to better match the browser behaviour, run nextTicks (and
subsequently the microtask queue) after each individual Timer and
Immediate, rather than after the whole list is processed. The
current behaviour is somewhat of a performance micro-optimization
and also partly dictated by how timer handles were implemented.

PR-URL: https://github.com/nodejs/node/pull/22842
Fixes: https://github.com/nodejs/node/issues/22257


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>