FE: add tests for KT-53966 (positive/negative)

compiler/testData/diagnostics/tests/samConversions/samConversionWithCondition.fir.kt

@@ -0,0 +1,14 @@
+fun main() {
+    val flag = true
+    consumeTicker(
+        if (flag) null else <!ARGUMENT_TYPE_MISMATCH!>{ num -> num.<!UNRESOLVED_REFERENCE!>dec<!>() }<!>
+    )
+}
+
+fun consumeTicker(ticker: Ticker?) {
+
+}
+
+fun interface Ticker {
+    fun tick(num: Int)
+}

compiler/testData/diagnostics/tests/samConversions/samConversionWithCondition.kt

@@ -0,0 +1,14 @@
+fun main() {
+    val flag = true
+    consumeTicker(
+        if (flag) null else { num -> num.dec() }
+    )
+}
+
+fun consumeTicker(ticker: Ticker?) {
+
+}
+
+fun interface Ticker {
+    fun tick(num: Int)
+}

compiler/testData/diagnostics/tests/samConversions/samConversionWithCondition.txt

@@ -0,0 +1,11 @@
+package
+
+public fun consumeTicker(/*0*/ ticker: Ticker?): kotlin.Unit
+public fun main(): kotlin.Unit
+
+public fun interface Ticker {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract fun tick(/*0*/ num: kotlin.Int): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}