Implement equals/hashCode as this class previously was a data one

Fixes duplicated diagnostics in tests

compiler/frontend/src/org/jetbrains/kotlin/resolve/deprecation/Deprecation.kt

@@ -47,6 +47,24 @@ internal sealed class DeprecatedByAnnotation(
                 "HIDDEN" -> HIDDEN
                 else -> WARNING
             }
+
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other !is StandardDeprecated) return false
+
+            if (annotation != other.annotation) return false
+            if (target != other.target) return false
+            if (propagatesToOverrides != other.propagatesToOverrides) return false
+
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var hash = annotation.hashCode()
+            hash = hash * 31 + target.hashCode()
+            hash = hash * 31 + propagatesToOverrides.hashCode()
+            return hash
+        }
     }
 
     class DeprecatedSince(
@@ -54,7 +72,27 @@ internal sealed class DeprecatedByAnnotation(
         target: DeclarationDescriptor,
         propagatesToOverrides: Boolean,
         override val deprecationLevel: DeprecationLevelValue
-    ) : DeprecatedByAnnotation(annotation, target, propagatesToOverrides)
+    ) : DeprecatedByAnnotation(annotation, target, propagatesToOverrides) {
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other !is DeprecatedSince) return false
+
+            if (annotation != other.annotation) return false
+            if (target != other.target) return false
+            if (propagatesToOverrides != other.propagatesToOverrides) return false
+            if (deprecationLevel != other.deprecationLevel) return false
+
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var hash = annotation.hashCode()
+            hash = hash * 31 + target.hashCode()
+            hash = hash * 31 + propagatesToOverrides.hashCode()
+            hash = hash * 31 + deprecationLevel.hashCode()
+            return hash
+        }
+    }
 
     companion object {
         fun create(