JvmDefault: remove most tests on @JvmDefault

The tests are removed because JvmDefault is going to be deprecated with
error in KT-54746 and removed later in KT-57696.

Many of the removed tests already had existing counterparts with the new
modes `all` and `all-compatibility`. In this change, I've added such
tests where they were missing, and removed tests which were testing
behavior specific to the JvmDefault annotation, such as some
diagnostics.

 #KT-54746

compiler/testData/writeFlags/jvm8/defaults/all-compatibility/defaultImplementations.kt

@@ -0,0 +1,21 @@
+// !JVM_DEFAULT_MODE: all-compatibility
+// JVM_TARGET: 1.8
+// WITH_STDLIB
+
+interface A {
+    fun foo(x: Int = 0): Int {
+        return x
+    }
+}
+
+// TESTED_OBJECT_KIND: innerClass
+// TESTED_OBJECTS: A, DefaultImpls
+// FLAGS: ACC_FINAL, ACC_STATIC, ACC_PUBLIC
+
+// TESTED_OBJECT_KIND: function
+// TESTED_OBJECTS: A, foo$default
+// FLAGS: ACC_PUBLIC, ACC_SYNTHETIC,  ACC_STATIC
+
+// TESTED_OBJECT_KIND: function
+// TESTED_OBJECTS: A$DefaultImpls, foo$default
+// FLAGS: ACC_PUBLIC, ACC_SYNTHETIC, ACC_STATIC