Let Dedicated EThreads use `EThread::schedule` (#7228)
Let Dedicated EThreads use `EThread::schedule` (#7228)

`EThread::schedule_local` allows calls from `Dedicated` `EThreads` by
scheduling events on the `ET_CALL` pool. This change brings the same
behavior to the `EThread::schedule` function.
bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,duke8253/trafficserver,pbchou/trafficserver,duke8253/trafficserver