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/builderInference/theSimplestBuilder.kt

@@ -0,0 +1,13 @@
+// FIR_IDENTICAL
+interface Box<F> {
+    fun add(f: F)
+    fun get(): F
+}
+
+fun <E> myBuilder(x: Box<E>.() -> Unit): Box<E> = TODO()
+
+fun main() {
+    myBuilder {
+        add("")
+    }.get().length
+}