[NI] Decrease priority of Integer Literal Types in type checking

#KT-30446

compiler/testData/diagnostics/testsWithStdLib/inference/integerLiterals.kt

@@ -0,0 +1,24 @@
+// !LANGUAGE: +NewInference
+// !WITH_NEW_INFERENCE
+// !DIAGNOSTICS: -USELESS_ELVIS -UNUSED_EXPRESSION
+
+class X {
+    fun toLong(): Long? = TODO()
+}
+
+fun getLong(): Long = TODO()
+
+fun test_1(list: List<X>) {
+    val props = list.map { <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Long?")!>it.toLong()<!> ?: <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Long")!>0<!> }
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.List<kotlin.Long>")!>props<!>
+}
+
+fun test_2(cond: Boolean) {
+    val props = if (cond) getLong() else 0
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Long")!>props<!>
+}
+
+fun test_3(list: List<X>) {
+    val props = list.map { Pair(it.toLong() ?: 0, it.toLong() ?: 0) }
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.List<kotlin.Pair<kotlin.Long, kotlin.Long>>")!>props<!>
+}

compiler/testData/diagnostics/testsWithStdLib/inference/integerLiterals.txt

@@ -0,0 +1,14 @@
+package
+
+public fun getLong(): kotlin.Long
+public fun test_1(/*0*/ list: kotlin.collections.List<X>): kotlin.Unit
+public fun test_2(/*0*/ cond: kotlin.Boolean): kotlin.Unit
+public fun test_3(/*0*/ list: kotlin.collections.List<X>): kotlin.Unit
+
+public final class X {
+    public constructor X()
+    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 final fun toLong(): kotlin.Long?
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}