K2: handle suspend anonymous functions properly in various compiler parts

#KT-58332 Fixed

compiler/testData/diagnostics/tests/suspendConversion/suspendCallFromAnonymousSuspend.fir.txt

@@ -0,0 +1,9 @@
+FILE: suspendCallFromAnonymousSuspend.kt
+    public final fun foo(): R|kotlin/Unit| {
+        suspend fun <anonymous>(): R|kotlin/Unit| <inline=Unknown>  {
+            R|/bar|()
+        }
+
+    }
+    public final suspend fun bar(): R|kotlin/Unit| {
+    }

compiler/testData/diagnostics/tests/suspendConversion/suspendCallFromAnonymousSuspend.kt

@@ -0,0 +1,12 @@
+// FIR_IDENTICAL
+// FIR_DUMP
+
+fun foo() {
+    suspend fun() {
+        bar()
+    }
+}
+
+suspend fun bar() {
+
+}