[Build] Add jUnit dependencies in testApiJUnit5 to the implementation configuration

Adding these dependencies to the `api` configuration pollutes classpath for each dependant modules even if it doesn't need them. Instead, the dependencies should be declared more granularly if they're required
#KTI-1349 In Progress

compiler/tests-different-jdk/build.gradle.kts

@@ -11,8 +11,8 @@ dependencies {
     testApi(projectTests(":compiler:tests-common-new"))
 
     testApiJUnit5()
-    testApi(libs.junit.platform.runner)
-    testApi(libs.junit.platform.suite.api)
+    testImplementation(libs.junit.platform.runner)
+    testImplementation(libs.junit.platform.suite.api)
     runtimeOnly(libs.junit.vintage.engine)
 
     testImplementation(intellijCore())