[TEST] Migrate AbstractDiagnosticsWithExplicitApi to new test runners

compiler/testData/diagnostics/tests/testsWithExplicitApi/interfaces.fir.kt

@@ -0,0 +1,35 @@
+// SKIP_TXT
+
+interface I1 {
+    fun i()
+}
+
+public interface I2 {
+    fun i()
+}
+
+public interface I3 {
+    public fun i()
+    public val v: Int
+}
+
+public interface I4 {
+    public fun i(): Int
+    public val v: Int
+}
+
+public class Impl: I3 {
+    override fun i() {}
+    override val v: Int
+        get() = 10
+}
+
+public class Impl2: I4 {
+    override fun i() = 10
+    override val v = 10
+}
+
+private class PrivateImpl: I4 {
+    override fun i() = 10
+    override val v = 10
+}