matrix-api: Upload filter and use it for sync

So that the network usage can be reduced
7 jobs for wip/sadiq/matrix-filter in 10 minutes and 51 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #372259
librem5

00:02:41

 
  Test
passed check-po #372261
librem5

00:00:32

passed test:debian-gcc #372260
librem5

00:02:39

21.2%
 
  Package
passed package-pureos-byzantium #372262
librem5

00:01:39

passed package-pureos-byzantium:arm64 #372263
librem5:arm64

00:05:28

 
  Test Package
passed autopkgtest-pureos-byzantium-package #372264
librem5

00:01:18

passed lintian-pureos-byzantium-package #372265
librem5

00:00:53