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/cfg/jumps.dot

@@ -127,7 +127,7 @@ digraph jumps_kt {
             }
             51 [label="Variable declaration: lval y: R|kotlin/Int?|"];
             52 [label="Access variable R|<local>/y|"];
-            53 [label="Function call: R|<local>/y|.<Inapplicable(INAPPLICABLE_WRONG_RECEIVER): kotlin/Int.inc>#()"];
+            53 [label="Function call: R|<local>/y|.<Inapplicable(UNSAFE_CALL): kotlin/Int.inc>#()"];
             54 [label="Exit block"];
         }
         55 [label="Exit function test_2" style="filled" fillcolor=red];

compiler/fir/analysis-tests/testData/resolve/cfg/jumps.fir.txt

@@ -22,7 +22,7 @@ FILE: jumps.kt
             }
         }
 
-        R|<local>/y|.<Inapplicable(INAPPLICABLE_WRONG_RECEIVER): kotlin/Int.inc>#()
+        R|<local>/y|.<Inapplicable(UNSAFE_CALL): kotlin/Int.inc>#()
     }
     public final fun test_3(x: R|kotlin/Int?|): R|kotlin/Unit| {
         while(Boolean(true)) {