feat: introduce extended integration tests

- test both FLOSS and non-floss builds
- test on Synapse, Dendrite and Conduit
- remove Synapse-specific test
- add static Release mode app launch test

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

scripts/prepare-android-release.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-git apply ./scripts/enable-android-google-services.patch
 cd android
 echo $FDROID_KEY | base64 --decode --ignore-garbage > key.jks
 echo "storePassword=${FDROID_KEY_PASS}" >> key.properties