Convert the unit test from java to kotlin

[phaiting]

Summary

This change converts the unit test from java to kotlin.

Test plan

./gradlew :executorch_android:testDebugUnitTest

[pytorch-bot]

🔗 Helpful Links

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[kirklandsign]

Right now we have

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

is 1.8 possible? Otherwise we make everything 17?

[phaiting]

Yes, we should make it to use 1.8 for kotlin compiler as well for the compatibility, will update.

[phaiting]

@pytorchbot label "topic: not user facing"

[kirklandsign]

* What went wrong:
Execution failed for task ':executorch_android:checkDebugAndroidTestAarMetadata'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
   > 2 issues were found when checking AAR metadata:
     
       1.  Dependency 'androidx.core:core:1.16.0' requires libraries and applications that
           depend on it to compile against version 35 or later of the
           Android APIs.
     
           :executorch_android is currently compiled against android-34.
     
           Recommended action: Update this project to use a newer compileSdk
           of at least 35, for example 35.
     
           Note that updating a library or application's compileSdk (which
           allows newer APIs to be used) can be done separately from updating
           targetSdk (which opts the app in to new runtime behavior) and
           minSdk (which determines which devices the app can be installed
           on).
     
       2.  Dependency 'androidx.core:core-ktx:1.16.0' requires libraries and applications that
           depend on it to compile against version 35 or later of the
           Android APIs.
     
           :executorch_android is currently compiled against android-34.
     
           Recommended action: Update this project to use a newer compileSdk
           of at least 35, for example 35.
     
           Note that updating a library or application's compileSdk (which
           allows newer APIs to be used) can be done separately from updating

[phaiting]

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