Publish embedded package for releases of Element Call

Part of https://github.com/element-hq/element-call/issues/2994

This PR:

- Publishes embedded builds as Tarball, NPM, AAR, SwiftPM for releases
- Publishes full builds as Tarball for releases
- Adds comments to release notes with the built artifact locations

embedded/android/.gitignore

@@ -0,0 +1,11 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+
+# Ignore local gradle properties file
+local.properties
+
+# Also ignore the generated assets for Android
+lib/src/main/assets