Add callee name to diagnostic about illegal suspension call

#KT-15938 Fixed

idea/testData/diagnosticMessage/illegalSuspendCall.kt

@@ -0,0 +1,7 @@
+// !DIAGNOSTICS_NUMBER: 1
+// !DIAGNOSTICS: ILLEGAL_SUSPEND_FUNCTION_CALL
+suspend fun foo() {}
+
+fun noSuspend() {
+    foo()
+}

idea/testData/diagnosticMessage/illegalSuspendCall1.txt

@@ -0,0 +1,2 @@
+<!-- illegalSuspendCall1 -->
+Suspend function 'foo' should be called only from a coroutine or another suspend function