K2: Add new tests for PCLA implementation

Many of them have been found & minimized at FP tests/user projects

^KT-59791 Fixed

compiler/testData/diagnostics/tests/inference/notFixedTopLevelLambdaParameter.kt

@@ -0,0 +1,18 @@
+// FIR_IDENTICAL
+class Controller<T> {
+    fun yield(t: T): Boolean = true
+}
+
+fun <T1> Controller<T1>.forEach(x: (T1) -> Unit) {}
+
+fun <S> generate(g: suspend Controller<S>.() -> Unit): S = TODO()
+
+fun main() {
+    generate {
+        forEach {
+            foo(it)
+        }
+    }.length
+}
+
+fun foo(x: String) {}