Media: Notify media change when updating metas

Fix #97
4 jobs for notify_on_media_meta_changed in 15 minutes and 53 seconds (queued for 8 minutes and 33 seconds)
Status Job ID Name Coverage
  Test
passed #280534
amd64 debian
asan-ubsan

00:08:54

passed #280531
amd64 debian
linux

00:06:57

passed #280532
win32
win32

00:10:54

passed #280533
win64
win64

00:10:40