ci: run the native engine's unit tests on pull requests into fullnative-dev

[bgrana75]

CI: run the native engine's unit tests on pull requests into fullnative-dev

Nothing in CI builds or tests android-native/, so a native change can only be checked by someone with a local Android toolchain. This adds a native-engine job to .github/workflows/ci.yml:

• runs cd android-native && ./gradlew :engine:testDebugUnitTest;
• only on pull requests into fullnative-dev (if: github.base_ref == 'fullnative-dev'); the TypeScript job is unchanged;
• JDK 17 (Temurin), the Android SDK (android-actions/setup-android), and the NDK and CMake versions pinned in engine/build.gradle.kts, read from that file so they can't drift (today NDK 27.1.12297006, CMake 3.22.1);
• checks out the llama.cpp and zstd submodules;
• caches Gradle (gradle/actions/setup-gradle);
• uploads engine/build/reports/tests/ when a test fails.

The job runs on this PR itself, so its result here is the test: it should report the same 99 passing tests as a local run.

I haven't run Gradle locally (no Android toolchain on this machine), and no CodeRabbit CLI review was run before pushing (cr isn't installed here).

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[rferrari]

Approve. Checked locally with #77–#80 merged on top of fullnative-dev (fc6b923):
:engine:testDebugUnitTest 112/112 and :app:compileDebugKotlin pass. Reading the NDK and
CMake versions from engine/build.gradle.kts is a good call. The fork's runs need a
maintainer's approval before they start; I'll approve them before merging.