[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

libraries/scripting/common/build.gradle.kts

@@ -8,7 +8,7 @@ project.updateJvmTarget("1.8")
 dependencies {
     api(kotlinStdlib())
     compileOnly(commonDependency("org.jetbrains.kotlin:kotlin-reflect")) { isTransitive = false }
-    testApi(libs.junit4)
+    testImplementation(libs.junit4)
 }
 
 sourceSets {

libraries/scripting/dependencies/build.gradle.kts

@@ -8,7 +8,7 @@ project.updateJvmTarget("1.8")
 dependencies {
     api(kotlinStdlib())
     api(project(":kotlin-scripting-common"))
-    testApi(libs.junit4)
+    testImplementation(libs.junit4)
     testImplementation(commonDependency("org.jetbrains.kotlinx", "kotlinx-coroutines-core"))
 }
 

libraries/scripting/jsr223-test/build.gradle.kts

@@ -17,7 +17,7 @@ val testJsr223Runtime by configurations.creating {
 val testCompilationClasspath by configurations.creating
 
 dependencies {
-    testApi(libs.junit4)
+    testImplementation(libs.junit4)
     testCompileOnly(project(":kotlin-scripting-jvm-host-unshaded"))
     testCompileOnly(project(":compiler:cli"))
     testCompileOnly(project(":core:util.runtime"))

libraries/scripting/jvm/build.gradle.kts

@@ -9,7 +9,7 @@ dependencies {
     api(project(":kotlin-script-runtime"))
     api(kotlinStdlib())
     api(project(":kotlin-scripting-common"))
-    testApi(libs.junit4)
+    testImplementation(libs.junit4)
 }
 
 sourceSets {