[Build] Move JUnit dependencies into the version catalog

The `kotlin-test` dependencies are left untouched as changing them affects publications, thus these versions are independent from the used inside our build
#KTI-1349 In Progress

prepare/compiler-client-embeddable/build.gradle.kts

@@ -21,7 +21,7 @@ dependencies {
     testApi(project(":compiler:cli-common"))
     testApi(project(":daemon-common"))
     testApi(project(":kotlin-daemon-client"))
-    testApi(commonDependency("junit:junit"))
+    testApi(libs.junit4)
     testApi(project(":kotlin-test:kotlin-test-jvm"))
     testApi(project(":kotlin-test:kotlin-test-junit"))
     testCompilerClasspath(project(":kotlin-compiler"))

prepare/compiler-embeddable/build.gradle.kts

@@ -22,7 +22,7 @@ dependencies {
     runtimeOnly(commonDependency("org.jetbrains.kotlin:kotlin-reflect")) { isTransitive = false }
     runtimeOnly(project(":kotlin-daemon-embeddable"))
     runtimeOnly(commonDependency("org.jetbrains.intellij.deps", "trove4j"))
-    testApi(commonDependency("junit:junit"))
+    testApi(libs.junit4)
     testApi(project(":kotlin-test:kotlin-test-junit"))
     testCompilationClasspath(kotlinStdlib())
 }