[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

native/commonizer-api/build.gradle.kts

@@ -13,7 +13,7 @@ dependencies {
     implementation(kotlinStdlib())
     implementation(project(":native:kotlin-native-utils"))
     testImplementation(project(":kotlin-test::kotlin-test-junit"))
-    testImplementation(commonDependency("junit:junit"))
+    testImplementation(libs.junit4)
     testImplementation(projectTests(":compiler:tests-common"))
     testRuntimeOnly(project(":native:kotlin-klib-commonizer"))
     testImplementation(project(":kotlin-gradle-plugin"))

native/commonizer/build.gradle.kts

@@ -38,7 +38,7 @@ dependencies {
 
     api(kotlinStdlib())
 
-    testImplementation(commonDependency("junit:junit"))
+    testImplementation(libs.junit4)
     testImplementation(projectTests(":compiler:tests-common"))
     testImplementation(project(":kotlinx-metadata-klib")) { isTransitive = false }
     testImplementation(project(":kotlinx-metadata")) { isTransitive = false }

native/utils/build.gradle.kts

@@ -11,7 +11,7 @@ dependencies {
     api(project(":kotlin-util-klib"))
     api(platform(project(":kotlin-gradle-plugins-bom")))
 
-    testImplementation(commonDependency("junit:junit"))
+    testImplementation(libs.junit4)
     testImplementation(kotlinStdlib())
     testImplementation(commonDependency("org.jetbrains.kotlin:kotlin-reflect")) { isTransitive = false }
     testApiJUnit5()