[FIR] Fix inconsistent RETURN_TYPE_MISMATCH and TYPE_MISMATCH reporting on functions and properties

^KT-51203 Fixed

compiler/fir/analysis-tests/testData/resolveWithStdlib/diagnostics/functionReturnTypeMismatchChecker/basic.kt

@@ -12,7 +12,7 @@ fun ok(): Int {
 }
 
 fun okOneLineFunction(): Int = 10 + 1
-fun errorOneLineFunction(): String = <!RETURN_TYPE_MISMATCH, TYPE_MISMATCH!>10 + 1<!>
+fun errorOneLineFunction(): String = <!RETURN_TYPE_MISMATCH!>10 + 1<!>
 
 class A {
     fun bar() {}
@@ -37,7 +37,7 @@ fun errorWithLambda(): String {
         return@foo
     } foo {
         bar()
-        return@foo 10
+        return@foo <!RETURN_TYPE_MISMATCH!>10<!>
     }
 
     return ""

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/lightMember.kt

@@ -8,5 +8,5 @@ abstract class LightMemberImpl<out D : PsiMember>(computeRealDelegate: () -> D)
 
 abstract class LightFieldImpl<D : PsiField>(computeRealDelegate: () -> D) : LightMemberImpl<PsiField>(computeRealDelegate) {
     override val delegate: D
-        get() = super.delegate
-}
+        get() = <!RETURN_TYPE_MISMATCH!>super.delegate<!>
+}