build: add JUnit platform launcher for test execution

Additionally, we add JUnit Platform Launcher which
is required for JUnit 5 tests in newer Gradle versions.

Author: enigbe

java/app/build.gradle

@@ -69,6 +69,7 @@ dependencies {
   testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
   testImplementation "org.mockito:mockito-core:$mockitoVersion"
   testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
+  testRuntimeOnly "org.junit.platform:junit-platform-launcher:1.9.0"
   testImplementation "org.hamcrest:hamcrest-library:2.2"
   testImplementation "org.testcontainers:junit-jupiter:1.17.6"
   testImplementation "org.testcontainers:postgresql:1.17.6"