Run Rust and Android tests with once test

This release adds first-class test support for Rust and Android projects to the once test workflow. Rust crates can now use the rust_test target, which compiles with rustc --test and reports results through Once’s standard test format. Android projects gain two new target kinds: android_local_test for host-side Java and Kotlin tests that run on the JVM, and android_instrumentation_test for device or emulator tests that install the app and test packages and run am instrument via ADB. Both local and device-backed tests produce normalized Once test results, so Android and Rust tests are now discoverable alongside the rest of your test suite.