[FIR] Add 3 type mismatch diagnostics

compiler/testData/diagnostics/testsWithStdLib/coroutines/suspendCovarianJavaOverride.fir.kt

@@ -23,7 +23,7 @@ class K2 : JavaClass() {
 }
 
 class K3 : JavaClass() {
-    override fun foo(x: Int, y: Continuation<String>): Any? = null
+    override fun foo(x: Int, y: Continuation<String>): <!RETURN_TYPE_MISMATCH_ON_OVERRIDE!>Any?<!> = null
 }
 
 fun builder(block: suspend () -> Unit) {}

compiler/testData/diagnostics/testsWithStdLib/coroutines/suspendFunctionType/lambdaInOverriddenValInitializer.fir.kt

@@ -7,7 +7,7 @@ interface Bar<T> {
 }
 
 class Test1 : Foo {
-    override val foo = {}
+    override val foo = <!PROPERTY_TYPE_MISMATCH_ON_OVERRIDE!>{}<!>
 }
 
 class Test2 : Foo {
@@ -15,7 +15,7 @@ class Test2 : Foo {
 }
 
 class Test3 : Bar<suspend () -> Unit> {
-    override val bar = {}
+    override val bar = <!PROPERTY_TYPE_MISMATCH_ON_OVERRIDE!>{}<!>
 }
 
 class Test4 : Bar<suspend () -> Unit> {