Replace deprecated lambda syntax in testData

It's done with similar constructions where possible trying to preserve
intended behavior.
Some usages are removed because they test exactly the feature that
we are going to drop soon.

compiler/testData/diagnostics/tests/regressions/kt306.kt

@@ -1,16 +1,17 @@
 // KT-306 Ambiguity when different this's have same-looking functions
 
 fun test() {
-    <!UNUSED_FUNCTION_LITERAL!>{<!DEPRECATED_LAMBDA_SYNTAX!>Foo.()<!> ->
-        bar();
-        {<!DEPRECATED_LAMBDA_SYNTAX!>Barr.()<!> ->
+    (fun Foo.() {
+        bar()
+        (fun Barr.() {
             this.bar()
             bar()
-        }
-    }<!>
-    <!UNUSED_FUNCTION_LITERAL!>{<!DEPRECATED_LAMBDA_SYNTAX!>Barr.()<!> ->
+        })
+    })
+    (fun Barr.() {
+        this.bar()
         bar()
-    }<!>
+    })
 }
 
 class Foo {

compiler/testData/diagnostics/tests/regressions/kt352.kt

@@ -2,18 +2,19 @@
 
 package kt352
 
-val f : (Any) -> Unit = { <!DEPRECATED_LAMBDA_SYNTAX!><!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>()<!> : Unit<!> -> }  //type mismatch
+val f : (Any) -> Unit = {  <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!><!>-> }  //type mismatch
 
 fun foo() {
-    val <!UNUSED_VARIABLE!>f<!> : (Any) -> Unit = { <!DEPRECATED_LAMBDA_SYNTAX!><!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>()<!> : Unit<!> -> }  //!!! no error
+    val <!UNUSED_VARIABLE!>f<!> : (Any) -> Unit = { <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!><!>-> }  //!!! no error
 }
 
 class A() {
-    val f : (Any) -> Unit = { <!DEPRECATED_LAMBDA_SYNTAX!><!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>()<!> : Unit<!> -> }  //type mismatch
+    val f : (Any) -> Unit = { <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!><!>-> }  //type mismatch
 }
 
 //more tests
-val g : () -> Unit = { <!DEPRECATED_LAMBDA_SYNTAX!>(): <!EXPECTED_RETURN_TYPE_MISMATCH!>Int<!><!> -> 42 }
+val g : () -> Unit = { <!UNUSED_EXPRESSION!>42<!> }
+val gFunction : () -> Unit = <!TYPE_MISMATCH!>fun(): Int = 1<!>
 
 val h : () -> Unit = { doSmth() }
 

compiler/testData/diagnostics/tests/regressions/kt352.txt

@@ -3,6 +3,7 @@ package
 package kt352 {
     public val f: (kotlin.Any) -> kotlin.Unit
     public val g: () -> kotlin.Unit
+    public val gFunction: () -> kotlin.Unit
     public val h: () -> kotlin.Unit
     public val testIt: (kotlin.Any) -> kotlin.Unit
     public fun doSmth(): kotlin.Int