Cover KT-60646 with regression tests

This behavior wasn't intended during KT-15470 coding. I only intended to
prohibit `@get:` target on things different from properties. But I
accidentally prohibited `@property` on things different from properties
too

But it's a bug fix anyway, so let's keep it.

I also re-checked the implementation of KT-15470, I don't see any other
unintentional prohibitions

compiler/testData/diagnostics/tests/annotations/withUseSiteTarget/propertyTargetOnEnumEntry_error.kt

@@ -0,0 +1,9 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +ProhibitUseSiteGetTargetAnnotations
+
+@Target(AnnotationTarget.PROPERTY) annotation class Annotation
+
+enum class Foo {
+    <!INAPPLICABLE_TARGET_ON_PROPERTY!>@property:Annotation<!>
+    Entry
+}

compiler/testData/diagnostics/tests/annotations/withUseSiteTarget/propertyTargetOnEnumEntry_warning.kt

@@ -0,0 +1,9 @@
+// FIR_IDENTICAL
+// !LANGUAGE: -ProhibitUseSiteGetTargetAnnotations
+
+@Target(AnnotationTarget.PROPERTY) annotation class Annotation
+
+enum class Foo {
+    <!INAPPLICABLE_TARGET_ON_PROPERTY_WARNING!>@property:Annotation<!>
+    Entry
+}