fix(android): respect --device on run-android when multiple devices connected (#2796)

* fix(android): respect --device on run-android when multiple devices connected

When `react-native run-android --device <serial>` is invoked with more
than one device or emulator attached, Gradle's `installDebug` task
silently installs on a device of its own choosing instead of the one
named by `--device`. The flag is honored only for the post-Gradle
`adb install` step in `tryInstallAppOnDevice`, which is too late: the
APK has already been pushed to the wrong device, and on a fresh
emulator the second adb install can fail outright due to a
debug-keystore mismatch left behind by the Gradle install.

Root cause: `runOnSpecificDevice` builds the Gradle task list with the
`'install'` prefix (yielding `app:installDebug`) but neither sets
`ANDROID_SERIAL` on the gradle spawn nor passes
`-Pandroid.injected.serial=<device>`, so AGP picks a device by its
own logic. The interactive path already side-steps this by swapping
the build task to `assemble*` (line ~230), but the non-interactive
path keeps using `install*`.

This change mirrors that swap for the non-interactive path: Gradle
builds `app:assembleDebug` (or the corresponding flavored variant) and
`tryInstallAppOnDevice` then runs `adb -s <device> install -r -d <apk>`
as it always has, so the install lands on the device the user asked
for. No environment variables, no AGP-injected properties, and no
behavior change when only one device is connected.

`runOnAllDevices` is unchanged: it still uses `install*` because it
intentionally fans the install across every connected device.

* drop inline comment, explained in PR description

Author: janicduplessis

packages/cli-platform-android/src/commands/runAndroid/index.ts

@@ -236,7 +236,7 @@ function runOnSpecificDevice(
         androidProject.appName,
         args.mode,
         args.tasks ?? buildTask,
-        'install',
+        'assemble',
       );
 
       // using '-x lint' in order to ignore linting errors while building the apk