FIR: add UnsafeCall resolution diagnostics

Previously unsafe call is reported as part of InapplicableWrongReceiver.
This makes it difficult for the downstream checkers to report different
diagnostics.

compiler/fir/analysis-tests/testData/resolve/smartcasts/safeCalls/safeCalls.fir.txt

@@ -6,7 +6,7 @@ FILE: safeCalls.kt
     }
     public final fun test(x: R|kotlin/String?|): R|kotlin/Unit| {
         R|<local>/x|?.{ $subj$.R|/foo|(==(R|<local>/x|.R|kotlin/String.length|, Int(1))) }
-        R|<local>/x|.<Inapplicable(INAPPLICABLE_WRONG_RECEIVER): kotlin/String.length>#
+        R|<local>/x|.<Inapplicable(UNSAFE_CALL): kotlin/String.length>#
     }
     public abstract interface A : R|kotlin/Any| {
         public abstract fun bar(a: R|A|): R|kotlin/String|
@@ -28,7 +28,7 @@ FILE: safeCalls.kt
     }
     public final fun test_4(x: R|A?|): R|kotlin/Unit| {
         R|<local>/x|?.{ $subj$.R|/A.id|() }?.{ $subj$.R|/A.bool|() }
-        R|<local>/x|.<Inapplicable(INAPPLICABLE_WRONG_RECEIVER): /A.id>#()
+        R|<local>/x|.<Inapplicable(UNSAFE_CALL): /A.id>#()
     }
     public final fun R|kotlin/Any?|.boo(b: R|kotlin/Boolean|): R|kotlin/Unit| {
     }
@@ -37,5 +37,5 @@ FILE: safeCalls.kt
             ^test_5 Unit
         }
         ) }?.{ $subj$.R|/boo|(R|<local>/x|.R|/A.bool|()) }
-        R|<local>/x|.<Inapplicable(INAPPLICABLE_WRONG_RECEIVER): /A.id>#()
+        R|<local>/x|.<Inapplicable(UNSAFE_CALL): /A.id>#()
     }