[tests] Change builder inference tests in accordance with new K2 BI diagnostics

Related to KT-59369, KT-59390

compiler/testData/diagnostics/tests/builderInference/issues/kt60291c.fir.kt

@@ -1,27 +0,0 @@
-// ISSUE: KT-60291
-// CHECK_TYPE_WITH_EXACT
-
-fun test() {
-    val buildee = when ("") {
-        "true" -> build { setTypeVariable(TargetType()) }
-        "false" -> build {}
-        else -> Buildee()
-    }
-    // exact type equality check — turns unexpected compile-time behavior into red code
-    // considered to be non-user-reproducible code for the purposes of these tests
-    checkExactType<Buildee<TargetType>>(buildee)
-}
-
-
-
-
-class TargetType
-
-class Buildee<TV> {
-    fun setTypeVariable(value: TV) { storage = value }
-    private var storage: TV = null!!
-}
-
-fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
-    return Buildee<PTV>().apply(instructions)
-}